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New Member

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2 Messages

Friday, July 16th, 2021 3:14 PM

My SIM stopped working after i inserted it in my old att locked phone

I have att prepaid sim. i moved the sim to my old phone temporarily, as soon as i turned on the the phone, i received a message from att that this phone wont work and i should go to att.com??? so i pulled the sim back into my previous phone which is ATT Radiant Max, and still no service. any idea?

i am still waiting for tech support to get on the call.

Accepted Solution

ACE - Expert

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64.7K Messages

3 years ago

Your old phone is no longer supported and ATT will no longer activate unsupported phones. By putting your SIM card into the unsupported phone, you are trying to activate an unsupported phone, so the system automatically flags your line. To unflag your line and get service working again, you need to put the SIM card into a supported phone (which you have done) and contact customer support to unflag your line. You’ll just have to wait for tech support.

Accepted Solution

ACE - Expert

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35.8K Messages

3 years ago

Yes: Don't put your SIM into an unsupported phone.  As soon as you do, AT&T marks the account such that you have to contact Customer Service to clear that flag.

You now will have to talk to customer service.

(edited)

Accepted Solution

New Member

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2 Messages

3 years ago

Thank you Sandblaster and JefferMC. you are both 100% correct.

ATT responded saying if you move your sim card to a phone that is a 3g or an unsupported phone on the ATT network it will suspend your service and lock your sim. after they enabled my service the sim worked again. 

ATT also confirmed you can move the sim to another phone without calling them or having your service suspended if the the other phone is supported on the ATT 4g and 5g network and it is an unlocked phone.

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