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No voice on Mobile phone when regional electricity is turned off

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No voice on Mobile phone when regional electricity is turned off

I have access to SONY Xperia Z1, Z3, Z5 dual premium and XZ premium, all with AT&T SIM cards.  When ever the electric company goes on maintenance and shuts of the main power in my region:

Z1 looses antenna.

Z3, Z5 and XZ have antenna and LTE with full data; but no voice.

Which frequencies are missing?

 

My neighbor has an iPhone 7 with AT&T SIM card and voice and data is operational.

Thank you.

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Message 1 of 5
Administrator

Re: No voice on Mobile phone when regional electricity is turned off

Hello @Kadkhoda,

 

We can definitely answer that question for you. To work on our network, your device has to operate on one of these GSM frequencies:

  • 3G UMTS network - 850, 1900MHz bands
  • 4G LTE network - AWS, 700, 850, 1900MHz bands

If you're not sure which network frequencies your device supports, you'll need to check your device manufacturer’s website.

 

Please let us know if you have any further questions or concerns.

 

Sean, AT&T Community Specialist


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Re: No voice on Mobile phone when regional electricity is turned off

From the posting on web page

https://forums.att.com/t5/Network-Coverage/What-is-AT-amp-T-s-GSM-HSDPA-LTE-bands/m-p/4228054

 

Re: What is AT&T's GSM, HSDPA, LTE bands?

by
 ACE - Expert                                                 
Apr 12, 2015 6:08 PM
I saw all the bands, and those that has been decommissioned.
 
Sony models mentioned above have all those frequencies except AWS.
 
So my question that has not been answered is what is the difference in bands used by AT&T under normal operation, and that you have answered and all Sony models do have voice and data; versus when the main electricity is off the grid?  Does AT&T shut off some equipment to conserve backup energy?  And if yes which frequencies and bands go off the air?
 
For completeness I will also ask if there is a published policy on this or is it operated on an ad hoc basis in each region?
 
So that my reason for asking is clear to the reader:  We live in the Boondocks.  We have Electricity and telephone Land-lines and Mobile phone service from limited service providers.  No other utility, including cable TV, water, gas and sewage reaches us. The cost of operating a land line is too high so we have or are switching away from it.  Which means under emergency, in particular when electricity is off, we need to have a reliable Mobile phone connection.  There was no issue before AT&T started vacating the 2G bands.  Now, luckily, we have discovered that some of our mobile phones do not operate when electricity is cutoff.  That is the reason why I like to know which frequency and band may my life depend on in case of a power outage.
 
Thank you for your previous response.
 
 
Message 3 of 5
Administrator

Re: No voice on Mobile phone when regional electricity is turned off

Thank you for that information, @Kadkhoda.

 

When the power is out towers switch to back up battery/generator power. However, this is the only information that we can provide regarding tower frequencies. Let us know if you have any additional questions.

 

Makaela, AT&T Community Specialist.   


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ACE - Expert
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Accepted by Kadkhoda
‎08-14-2019 8:37 PM

Re: No voice on Mobile phone when regional electricity is turned off


@Kadkhoda wrote:

From the posting on web page

https://forums.att.com/t5/Network-Coverage/What-is-AT-amp-T-s-GSM-HSDPA-LTE-bands/m-p/4228054

 

Re: What is AT&T's GSM, HSDPA, LTE bands?

by
 ACE - Expert                                                 
Apr 12, 2015 6:08 PM
I saw all the bands, and those that has been decommissioned.
 
Sony models mentioned above have all those frequencies except AWS.
 
So my question that has not been answered is what is the difference in bands used by AT&T under normal operation, and that you have answered and all Sony models do have voice and data; versus when the main electricity is off the grid?  Does AT&T shut off some equipment to conserve backup energy?  And if yes which frequencies and bands go off the air?
 
For completeness I will also ask if there is a published policy on this or is it operated on an ad hoc basis in each region?
 
So that my reason for asking is clear to the reader:  We live in the Boondocks.  We have Electricity and telephone Land-lines and Mobile phone service from limited service providers.  No other utility, including cable TV, water, gas and sewage reaches us. The cost of operating a land line is too high so we have or are switching away from it.  Which means under emergency, in particular when electricity is off, we need to have a reliable Mobile phone connection.  There was no issue before AT&T started vacating the 2G bands.  Now, luckily, we have discovered that some of our mobile phones do not operate when electricity is cutoff.  That is the reason why I like to know which frequency and band may my life depend on in case of a power outage.
 
Thank you for your previous response.
 
 

@Kadkhoda 

 

my post was from 2015 lots have changed since that time

 

You need to get a phone that will do VoLTE and none of those sony phones will do that.  If you want a cellular connection that works its time to get a branded ATT phone, iPhone or pixel 3 or 3a series phone as they all support VoLTE.

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