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Posted Dec 14, 2013
1:18:12 PM
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GSM Frequencies

Does ATT support GSM 900 and 1800 MHz frequencies?

 

I'm trying to get a GSM 2G alarm system set up and don't show any bars at all, no matter where I place the main unit. I put the SIM in my GoPhone as a test. That SIM works fine in my GoPhone, 5 bars too.

 

The other possibility is obvious if the frequencies are OK.

Does ATT support GSM 900 and 1800 MHz frequencies?

 

I'm trying to get a GSM 2G alarm system set up and don't show any bars at all, no matter where I place the main unit. I put the SIM in my GoPhone as a test. That SIM works fine in my GoPhone, 5 bars too.

 

The other possibility is obvious if the frequencies are OK.

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Dec 16, 2013 8:20:24 AM
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tazman556 wrote:

Does ATT support GSM 900 and 1800 MHz frequencies?

 

I'm trying to get a GSM 2G alarm system set up and don't show any bars at all, no matter where I place the main unit. I put the SIM in my GoPhone as a test. That SIM works fine in my GoPhone, 5 bars too.

 

The other possibility is obvious if the frequencies are OK.


Neither 900 nor 1800MHz frequencies are used in the US by any of the GSM operators. As

julywashere explained, US operators are on 850 and 1900MHz frequencies.
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.
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GSM Frequencies

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Dec 14, 2013 1:51:47 PM
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Also, this system is 2G only.

Also, this system is 2G only.

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Dec 14, 2013 7:34:24 PM
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Hi tazman,

 

AT&T uses different frequencies with different technologies. In some areas, they may not have a license to use both frequencies and use one exclusively. 

For GSM, they use 850 MHz and 1900 MHz. 
For HSPA+, they use 850 MHz (Band V) and 1900  MHz (Band II)
For LTE, they use 700 MHz (Band XVII) and some 1700 MHz (Band IV)

 

In your case, you'd be concerned with their GSM network. Which does not support the 900 Mhz frequency but does support the 1900 MHz band.

Hi tazman,

 

AT&T uses different frequencies with different technologies. In some areas, they may not have a license to use both frequencies and use one exclusively. 

For GSM, they use 850 MHz and 1900 MHz. 
For HSPA+, they use 850 MHz (Band V) and 1900  MHz (Band II)
For LTE, they use 700 MHz (Band XVII) and some 1700 MHz (Band IV)

 

In your case, you'd be concerned with their GSM network. Which does not support the 900 Mhz frequency but does support the 1900 MHz band.

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tazman556 wrote:

Does ATT support GSM 900 and 1800 MHz frequencies?

 

I'm trying to get a GSM 2G alarm system set up and don't show any bars at all, no matter where I place the main unit. I put the SIM in my GoPhone as a test. That SIM works fine in my GoPhone, 5 bars too.

 

The other possibility is obvious if the frequencies are OK.


Neither 900 nor 1800MHz frequencies are used in the US by any of the GSM operators. As

julywashere explained, US operators are on 850 and 1900MHz frequencies.

tazman556 wrote:

Does ATT support GSM 900 and 1800 MHz frequencies?

 

I'm trying to get a GSM 2G alarm system set up and don't show any bars at all, no matter where I place the main unit. I put the SIM in my GoPhone as a test. That SIM works fine in my GoPhone, 5 bars too.

 

The other possibility is obvious if the frequencies are OK.


Neither 900 nor 1800MHz frequencies are used in the US by any of the GSM operators. As

julywashere explained, US operators are on 850 and 1900MHz frequencies.
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

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Jun 24, 2014 5:31:24 PM
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Hi,

 

I'm planning to buy Galaxy Note 3 globally unlocked version. In the product description I've seen following line:

  • 3G: HSDPA 850 / 900 / 1900 / 2100

Does this mean that it will work fine with AT&T 3G?

Hi,

 

I'm planning to buy Galaxy Note 3 globally unlocked version. In the product description I've seen following line:

  • 3G: HSDPA 850 / 900 / 1900 / 2100

Does this mean that it will work fine with AT&T 3G?

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Jun 24, 2014 6:48:37 PM
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sribasu wrote:

Hi,

 

I'm planning to buy Galaxy Note 3 globally unlocked version. In the product description I've seen following line:

  • 3G: HSDPA 850 / 900 / 1900 / 2100

Does this mean that it will work fine with AT&T 3G?


Yes, that means it'll work on the HSPA+ network. It may not work on the LTE network.


sribasu wrote:

Hi,

 

I'm planning to buy Galaxy Note 3 globally unlocked version. In the product description I've seen following line:

  • 3G: HSDPA 850 / 900 / 1900 / 2100

Does this mean that it will work fine with AT&T 3G?


Yes, that means it'll work on the HSPA+ network. It may not work on the LTE network.

*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

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Oct 3, 2014 10:21:08 PM
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Hi,

I am looking to buy an unlocked modem like this, but not sure if it works in ATT network. It is unlock. It does support 850/1900mhz, but the spec said these frequencies are only for GSM and GPRS.

 

Vodafone K5150 (also K5150H) is a new 4G LTE Cat4 USB Stick from HUAWEI to support maximum download speed to 150Mbps and upload speed to 50Mbps. The HUAWEI K5150 supports LTE band 1, band 3, band 7 and band 20(800/1800/2100/2600MHz). Like its predecessor HUAWEI K5005, the unlocked K5150 Vodafone internet stick could also support 3G UMTS/DC-HSPA+ & 2G GRPS/GSM network.

Specifications:
* 4G LTE FDD Band 1/3/7/20: 800/1800/2100/2600MHz
* 3G DC-HSPA+/UMTS/WCDMA 900/2100MHz
* GSM/GPRS 850/900/1800/1900MHz

 

Thanks,

Justin

Hi,

I am looking to buy an unlocked modem like this, but not sure if it works in ATT network. It is unlock. It does support 850/1900mhz, but the spec said these frequencies are only for GSM and GPRS.

 

Vodafone K5150 (also K5150H) is a new 4G LTE Cat4 USB Stick from HUAWEI to support maximum download speed to 150Mbps and upload speed to 50Mbps. The HUAWEI K5150 supports LTE band 1, band 3, band 7 and band 20(800/1800/2100/2600MHz). Like its predecessor HUAWEI K5005, the unlocked K5150 Vodafone internet stick could also support 3G UMTS/DC-HSPA+ & 2G GRPS/GSM network.

Specifications:
* 4G LTE FDD Band 1/3/7/20: 800/1800/2100/2600MHz
* 3G DC-HSPA+/UMTS/WCDMA 900/2100MHz
* GSM/GPRS 850/900/1800/1900MHz

 

Thanks,

Justin

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Oct 4, 2014 6:52:09 AM
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jzforty wrote:

Hi,

I am looking to buy an unlocked modem like this, but not sure if it works in ATT network. It is unlock. It does support 850/1900mhz, but the spec said these frequencies are only for GSM and GPRS.

 

Vodafone K5150 (also K5150H) is a new 4G LTE Cat4 USB Stick from HUAWEI to support maximum download speed to 150Mbps and upload speed to 50Mbps. The HUAWEI K5150 supports LTE band 1, band 3, band 7 and band 20(800/1800/2100/2600MHz). Like its predecessor HUAWEI K5005, the unlocked K5150 Vodafone internet stick could also support 3G UMTS/DC-HSPA+ & 2G GRPS/GSM network.

Specifications:
* 4G LTE FDD Band 1/3/7/20: 800/1800/2100/2600MHz
* 3G DC-HSPA+/UMTS/WCDMA 900/2100MHz
* GSM/GPRS 850/900/1800/1900MHz

 

Thanks,

Justin


Justin,

 

this modem will only work on AT&T in 2G (GPRS/EDGE) model. It does not have the necessary AT&T bands on either 3G or 4G radio. In order to fully function on A&T LTE network, your modem needs to support the following frequencies:

 

2G: 850/1900MHz

3G: 850/1900MHz

4G: Bands 2,4,5,17 (1900,1700,850,700MHZ)

 


jzforty wrote:

Hi,

I am looking to buy an unlocked modem like this, but not sure if it works in ATT network. It is unlock. It does support 850/1900mhz, but the spec said these frequencies are only for GSM and GPRS.

 

Vodafone K5150 (also K5150H) is a new 4G LTE Cat4 USB Stick from HUAWEI to support maximum download speed to 150Mbps and upload speed to 50Mbps. The HUAWEI K5150 supports LTE band 1, band 3, band 7 and band 20(800/1800/2100/2600MHz). Like its predecessor HUAWEI K5005, the unlocked K5150 Vodafone internet stick could also support 3G UMTS/DC-HSPA+ & 2G GRPS/GSM network.

Specifications:
* 4G LTE FDD Band 1/3/7/20: 800/1800/2100/2600MHz
* 3G DC-HSPA+/UMTS/WCDMA 900/2100MHz
* GSM/GPRS 850/900/1800/1900MHz

 

Thanks,

Justin


Justin,

 

this modem will only work on AT&T in 2G (GPRS/EDGE) model. It does not have the necessary AT&T bands on either 3G or 4G radio. In order to fully function on A&T LTE network, your modem needs to support the following frequencies:

 

2G: 850/1900MHz

3G: 850/1900MHz

4G: Bands 2,4,5,17 (1900,1700,850,700MHZ)

 

*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

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Oct 4, 2014 7:17:37 AM
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Edited by adidaskid808 on Oct 4, 2014 at 7:18:11 AM

Justin,
 This Asian,Australia and EU phone can only work in 2G & maybe in some area of USA with AT&T coverage.
3G and 4G will not work!!! DO NOT waste your money!!!!!
 

Justin,
 This Asian,Australia and EU phone can only work in 2G & maybe in some area of USA with AT&T coverage.
3G and 4G will not work!!! DO NOT waste your money!!!!!
 

*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

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Jan 21, 2015 7:12:55 PM
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So i have a phone that i got from a friend that i believe he may have gotten from china.  It is a lenovo and says the bandwiths are 850/900/1800/1900 mhz and 850/2100 mhz.  Will this work with AT&Ts 4G service as well as 3G.  Im planning to switch to them.

So i have a phone that i got from a friend that i believe he may have gotten from china.  It is a lenovo and says the bandwiths are 850/900/1800/1900 mhz and 850/2100 mhz.  Will this work with AT&Ts 4G service as well as 3G.  Im planning to switch to them.

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Jan 22, 2015 7:17:52 AM
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As my post before,most cell phones you can buy in Mainland China are mostly for their local market.
This Lenovo famous Brand name phone will work on 2G GSM all over the world .
That's why in Mainland China they called it "WORLD/INTERNATION PHONE " Smiley Happy
3G you may get limited coverage or none.

4G?? No way.

As my post before,most cell phones you can buy in Mainland China are mostly for their local market.
This Lenovo famous Brand name phone will work on 2G GSM all over the world .
That's why in Mainland China they called it "WORLD/INTERNATION PHONE " Smiley Happy
3G you may get limited coverage or none.

4G?? No way.

*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

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Feb 7, 2015 4:33:20 PM
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So I am a bit confused.  I live in Los Angeles, California. I am trying to find/purchase a LG G3, unlocked so that I can purchase a SIM card to use with Cricket Wireless which uses the AT&T network. The problem is that I see two different models, the D855 and the D850.  It says that the D855 is the international model with modes: GSM 850/900/1800/1900

                                                                       UMTS 850/900/1900/2100

                                                                       LTE     800/900/1800/2100/2600

 

The D850 has modes:  GSM 850/900/1800/1900

                                      UMTS 850/900/1900/2100

                                      LTE 700/850/1700/1900/2100

 

So which one is the one I should purchase that will work with Cricket giving me 4G LTE? I don't want to get the wrong one that will only give me 3G data. Any help will be greatly appreciated!!

So I am a bit confused.  I live in Los Angeles, California. I am trying to find/purchase a LG G3, unlocked so that I can purchase a SIM card to use with Cricket Wireless which uses the AT&T network. The problem is that I see two different models, the D855 and the D850.  It says that the D855 is the international model with modes: GSM 850/900/1800/1900

                                                                       UMTS 850/900/1900/2100

                                                                       LTE     800/900/1800/2100/2600

 

The D850 has modes:  GSM 850/900/1800/1900

                                      UMTS 850/900/1900/2100

                                      LTE 700/850/1700/1900/2100

 

So which one is the one I should purchase that will work with Cricket giving me 4G LTE? I don't want to get the wrong one that will only give me 3G data. Any help will be greatly appreciated!!

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Feb 7, 2015 7:08:50 PM
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ACE - Guru
Edited by adidaskid808 on Feb 7, 2015 at 7:12:09 PM

 Good question about this LG G3 phone.
I got lots of friends living in LA ,a few have a LG G3

and they all seem to tell me the same thing with AT&T .
(And if Cricket use the same Band as AT&T.)
Both phone will work on 2G(GSM) & 3G(UMTS)  and (3G+ (H++)= 4G in North America.
And lots of time ,the phone can only work on 4G.
Because both model of LG G3  got one LTE band missing for AT&T.
so, it is very much depends on area you're in.
And sometime LTE traffic are too heavy in LA,your speed will get drop down to 4G.

 

 Good question about this LG G3 phone.
I got lots of friends living in LA ,a few have a LG G3

and they all seem to tell me the same thing with AT&T .
(And if Cricket use the same Band as AT&T.)
Both phone will work on 2G(GSM) & 3G(UMTS)  and (3G+ (H++)= 4G in North America.
And lots of time ,the phone can only work on 4G.
Because both model of LG G3  got one LTE band missing for AT&T.
so, it is very much depends on area you're in.
And sometime LTE traffic are too heavy in LA,your speed will get drop down to 4G.

 

*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

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Feb 7, 2015 7:45:57 PM
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Okay...so just to clarify. This phone IS capable of having LTE coverage in
LA?
Okay...so just to clarify. This phone IS capable of having LTE coverage in
LA?

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Feb 7, 2015 8:37:51 PM
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ACE - Guru
Edited by adidaskid808 on Feb 7, 2015 at 9:06:28 PM

It is capable to have AT&T LTE service.
Both LG G3  D850 and D855 .
But as my reply early.Both phones got some LTE bands missing for AT&T.
So, it is very much depends on which area of LA and where you using your phone.
But I will go for D850 ,since D855 are more for Asia and EU.

This is mainly from the data you give me.But last year 2014 July,I test out both phones D850 & D855 with AT&T Sim card,Both are on the $60 unlimited plan. In area of Jefferson,Koreatown,Chinatown & Santa Monica ,they mostly seem to like working on 4G most of the time Smiley Indifferent 

It is capable to have AT&T LTE service.
Both LG G3  D850 and D855 .
But as my reply early.Both phones got some LTE bands missing for AT&T.
So, it is very much depends on which area of LA and where you using your phone.
But I will go for D850 ,since D855 are more for Asia and EU.

This is mainly from the data you give me.But last year 2014 July,I test out both phones D850 & D855 with AT&T Sim card,Both are on the $60 unlimited plan. In area of Jefferson,Koreatown,Chinatown & Santa Monica ,they mostly seem to like working on 4G most of the time Smiley Indifferent 

*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

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Feb 7, 2015 9:35:57 PM
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That is very interesting. One last question. What if I was to get a
T-Mobile G3 for example. Will that one have the missing band or is it the
same as the AT&T LG G3?
That is very interesting. One last question. What if I was to get a
T-Mobile G3 for example. Will that one have the missing band or is it the
same as the AT&T LG G3?

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Feb 7, 2015 10:11:18 PM
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I have no idea about T mobile LG G3.but I know T mobile are using different frequent and bands from AT&T.
Because I am one of the unhappy customer with them before.
Last year in July,the LG G3 phone just come out brand new in Asia market.
some friends of mine just brought them unlocked and bring it over to LA. using AT&T. network.
She would like to sell the D855 to me for US$550.that's why we do all this testing,but I am not a big fan of LG brand.
I brought a Samsung Note 4 later.

I have no idea about T mobile LG G3.but I know T mobile are using different frequent and bands from AT&T.
Because I am one of the unhappy customer with them before.
Last year in July,the LG G3 phone just come out brand new in Asia market.
some friends of mine just brought them unlocked and bring it over to LA. using AT&T. network.
She would like to sell the D855 to me for US$550.that's why we do all this testing,but I am not a big fan of LG brand.
I brought a Samsung Note 4 later.

*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

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May 12, 2015 9:13:29 AM
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Hello everyone, this forum has been so helpful to me, but I still need a little direction/confirmation.

I want to purchase an international Samsung Galaxy Tab 4 LTE GSM UNLOCKED and use it as a phone / tablet.

Here are the stats:

2G bands GSM 850 / 900 / 1800 / 1900 

3G bands HSDPA 850 / 900 / 1900 / 2100 

4G bands LTE 800 / 850 / 900 / 1800 / 2100 / 2600

Speed HSPA 42.2/5.76 Mbps

LTE Cat4 150/50 Mbps 

According to the previous posts I think that it’s an ok purchase and that it will work on all AT&T networks including Straight Talk and Cricket. However I’m still not quite sure if I will have LTE.

Please let me know if I’ll have LTE or what speed I will have in general; I think I will have 4G most of the time but I could be totally wrong. Thanks J

Also, I live an hour away from Orlando zip here is 32780 if that helps.

Hello everyone, this forum has been so helpful to me, but I still need a little direction/confirmation.

I want to purchase an international Samsung Galaxy Tab 4 LTE GSM UNLOCKED and use it as a phone / tablet.

Here are the stats:

2G bands GSM 850 / 900 / 1800 / 1900 

3G bands HSDPA 850 / 900 / 1900 / 2100 

4G bands LTE 800 / 850 / 900 / 1800 / 2100 / 2600

Speed HSPA 42.2/5.76 Mbps

LTE Cat4 150/50 Mbps 

According to the previous posts I think that it’s an ok purchase and that it will work on all AT&T networks including Straight Talk and Cricket. However I’m still not quite sure if I will have LTE.

Please let me know if I’ll have LTE or what speed I will have in general; I think I will have 4G most of the time but I could be totally wrong. Thanks J

Also, I live an hour away from Orlando zip here is 32780 if that helps.

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Oct 13, 2015 5:50:56 AM
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The ATT D850 LG G3 has Band 3 1800 on the hardware for LTE i believe. So LTE on 1800mhz will work right if there was a 1800mhz network for LTE available?

The ATT D850 LG G3 has Band 3 1800 on the hardware for LTE i believe. So LTE on 1800mhz will work right if there was a 1800mhz network for LTE available?

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Oct 13, 2015 6:49:08 AM
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ATT uses BANDS 2,4,5,17 for LTE they dont use band 3 its just in the phone.

ATT uses BANDS 2,4,5,17 for LTE they dont use band 3 its just in the phone.

*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

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Jun 5, 2016 11:54:43 AM
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 I am looking for a watch for my elderly father with dementia - I found one (from China of course) on Amazon.  It says that it has watch tracker support SMS/GPRS/TCP/UDP,SMS and the Internet to check the location information, Google plane and satellite maps;supports GSM 850/900/1800/1900 network SIM card - is that the right specifications for me to get the watch with a sim card put on my AT&T plan?

 I am looking for a watch for my elderly father with dementia - I found one (from China of course) on Amazon.  It says that it has watch tracker support SMS/GPRS/TCP/UDP,SMS and the Internet to check the location information, Google plane and satellite maps;supports GSM 850/900/1800/1900 network SIM card - is that the right specifications for me to get the watch with a sim card put on my AT&T plan?

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Jun 5, 2016 12:08:42 PM
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It won't work after the end of 2016 maybe before as att is shutting down the 2g network.
It won't work after the end of 2016 maybe before as att is shutting down the 2g network.
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

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Jun 5, 2016 4:04:44 PM
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I have a friend who went through the same concern for her mother.  We found some options

 

http://www.aplaceformom.com/blog/4-29-15-dementia-and-elderly-gps-tracking-devices/

 

And this one on Amazon

 

image.png

 

Most of the other trackers on Amazon are 2 G only and require a SIM card.  

We are customers too. Our answers are based on experience, knowledge and reading the terms of service and are honest, but not always appreciated. Please mark the correct answer. Please do not post personal information

I have a friend who went through the same concern for her mother.  We found some options

 

http://www.aplaceformom.com/blog/4-29-15-dementia-and-elderly-gps-tracking-devices/

 

And this one on Amazon

 

image.png

 

Most of the other trackers on Amazon are 2 G only and require a SIM card.  

We are customers too. Our answers are based on experience, knowledge and reading the terms of service and are honest, but not always appreciated. Please mark the correct answer. Please do not post personal information
We are customers too. Our answers are based on experience, knowledge and reading the terms of service and are honest, but not always appreciated. Please mark the correct answer. Please do not post personal information.
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

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