1. AC Question's Avatar
    I have a valid AT&T unlock code for my device. I have entered the code via using another SIM card and the ##7820#.When the SIM card is inserted (Walmart Family Mobile T-Mobile towers) the message "SIM ERROR" is displayed. I tried a 2nd WFM SIM card, same issue. I discovered the ##7820# with no SIM card inserted and when I enter my 20-digit code, the locked symbol shakes back and forth. I cannot get the code to work. AT&T customer service guarantees the code with my IMEI number and won't issue another code as the code provided is unique to my IMEI number.
    01-15-2015 07:19 PM
  2. anon8380037's Avatar
    Hello. Welcome to Android Central.

    I think you walked through the wrong door when you weren't looking.
    It's been done before

    You want Windows Central.

    I hope you get a solution.
    01-15-2015 07:49 PM

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