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userXiV1TZlQA1
Constellation

phone unlock

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i used to be with sprint.  now i am with at&t i had my sprint phone unlocked.  My phone is a samgung galaxy s7.  it was working fine until i did a system update and now it won't let me make or receive calls and text and mobile data is not working.  i have at&t sim card in the phone and i get a message saying "Invalid SIM card".  what can i do to get my phone working?

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Samsung Moderator
Samsung Moderator

Re: phone unlock

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@userXiV1TZlQA1 You will want to reach out to your carrier to resolve this issue. 

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2 REPLIES 2
Samsung Moderator
Samsung Moderator

Re: phone unlock

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@userXiV1TZlQA1 You will want to reach out to your carrier to resolve this issue. 

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userAaju9n3NII
Astronaut

Re: phone unlock

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Please I have problem upgrading my phone, its an international phone (USA) but i'm based in Nigeria... i called samsung and they refer me to my carrier... bcus the phone is locked and to unlock it i have to travel to the U.S to do that, pls is there no other way this can be done? all i want is to upgrade from 6.0 to 7.0 i have tried all i can. please i need assistance.

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