Do you need a different SIM Card to unlock your phone?

Scholar

Do you need a different SIM Card to unlock your phone?

I have my code to unlock my phone (Infuse 4G), and instructions from ATT Customer Care said that I will need to insert a different carrier SIM Card so that the unlock screen comes up to enter the code.

 

Well, I don't have another carrier SIM Card, and want to unlock the phone so that I can sell it for anyone to use on any carrier.

 

Is there another way to unlock with out using the non-ATT SIM Card?

 

Thanks!

 

BMan

Message 1 of 14 (81,238 Views)
Professor

Re: Do you need a different SIM Card to unlock your phone?

You need a nother carrier's SIM to unlock the phone.

Message 2 of 14 (81,237 Views)
Scholar

Re: Do you need a different SIM Card to unlock your phone?

[ Edited ]

Thanks Max for the quick reply.

 

Therefore, for me, my best course of action is to find a buddy's phone that's not on ATT and put their SIM Card into my phone?

 

Then go from there.

 

Another question, would my local corp ATT store have the ability to put a non-ATT SIM Card in?

Message 3 of 14 (81,233 Views)
Professor

Re: Do you need a different SIM Card to unlock your phone?

The store may have a SIM card laying around, but no guarantees. Your best bet is probably to borrow a friend's SIM. When I unlocked my Captivate I used a SIM that wasn't even active.

Message 4 of 14 (81,226 Views)
Master

Re: Do you need a different SIM Card to unlock your phone?


BMan17 wrote:

 

Therefore, for me, my best course of action is to find a buddy's phone that's not on ATT and put their SIM Card into my phone?

 


The only other US carrier in this case is T-Mobile.

 


Another question, would my local corp ATT store have the ability to put a non-ATT SIM Card in?


Unless one of the employee carries a T-mobile phone, the answer is NO.

 

Message 5 of 14 (81,225 Views)
Scholar

Re: Do you need a different SIM Card to unlock your phone?


foxbat121 wrote:

BMan17 wrote:

 

Therefore, for me, my best course of action is to find a buddy's phone that's not on ATT and put their SIM Card into my phone?

 


The only other US carrier in this case is T-Mobile.

 


Another question, would my local corp ATT store have the ability to put a non-ATT SIM Card in?


Unless one of the employee carries a T-mobile phone, the answer is NO.

 


Hmmm, now you have me thinking, I'm at work right now, but I do have an old TMobile SIM Card from my wife's old phone at home before she swtiched to ATT in 2009. Would that work?

Message 6 of 14 (81,221 Views)
Professor

Re: Do you need a different SIM Card to unlock your phone?

Can't hurt to try, right?

Message 7 of 14 (81,218 Views)
Master
Solution
Accepted by topic author BMan17
‎09-30-2015 1:39 AM

Re: Do you need a different SIM Card to unlock your phone?

[ Edited ]

It should work. You don't have to have a working SIM. As long as it is not an AT&T SIM, it will ask you for unlock code first thing the phone boots up.

 

Also beware, sometimes AT&T gives out wrong unlock code. You have a limited retries (5 times IIRC) before your phone permanently locked to AT&T.

Message 8 of 14 (81,214 Views)
Scholar

Re: Do you need a different SIM Card to unlock your phone?


Max69 wrote:

Can't hurt to try, right?



Ha, yeah, right, I have nothing to lose. At worst it just won't accept the SIM Card. At the same time I'd have to think once the phone sees a non-ATT SIM Card, it'll ask to unlock it, in which after I do that, I'm guessing it will try to connect to the TMobile network and get an unregistered notification or the like.

 

I'll try it tonight and report back.

Message 9 of 14 (81,211 Views)
Scholar

Re: Do you need a different SIM Card to unlock your phone?


foxbat121 wrote:

It should work. You don't have to have a working SIM. As long as it is not an AT&T SIM, it will ask you for unlock code first thing the phone boots up.

 

Also beware, sometimes AT&T gives out wrong unlock code. You have a limited retries (5 times IIRC) before your phone permanently locked to AT&T.


Thansk Foxbat, I posted same time as you.

 

I saw that 5 retries warning on another post. So I'll be careful on that....

Message 10 of 14 (81,209 Views)
Scholar

Re: Do you need a different SIM Card to unlock your phone?

[ Edited ]

BMan17 wrote:

foxbat121 wrote:

It should work. You don't have to have a working SIM. As long as it is not an AT&T SIM, it will ask you for unlock code first thing the phone boots up.

 

Also beware, sometimes AT&T gives out wrong unlock code. You have a limited retries (5 times IIRC) before your phone permanently locked to AT&T.


Thansk Foxbat, I posted same time as you.

 

I saw that 5 retries warning on another post. So I'll be careful on that....


Well, that was easy.

 

I actually rememebered that I have an old Blackberry 7100t sitting in my desk from when I was with TMobile. Popped the TMobile SIM Card in, asked for the unlock code, and bingo, accepted.

 

Then I got the "SIm Card not provisioned MM*2" Which is fine cause at that point it doesn't matter.


So good call Foxbat, it worked.

 

Now I assume then that I don't have to put the unlock code in anymore? I did it once and now the phone is free to be used on any carrier at any time? 

 

Message 11 of 14 (80,984 Views)
Master

Re: Do you need a different SIM Card to unlock your phone?

Once unlocked forever unlocked.

Message 12 of 14 (80,972 Views)
Highlighted
Contributor

Re: Do you need a different SIM Card to unlock your phone?

Is a new gophone sim card considered "non AT&T"?  Can I unlock my AT&T phone with a inactive gophone sim? 

Message 13 of 14 (40,816 Views)
Contributor

Re: Do you need a different SIM Card to unlock your phone?

I can recommend the site I used personally, namely the following one: http://sim-unlock.net . The whole process is automatic, so you'll receive you unlock code in no time. Due to detailed instructions and skillful staff I was able to unlock my phone in seconds. I came across the site when I was wading through reviews, of course the verified ones: https://www.google.com/shopping/seller?q=sim-unlock.net

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