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  1. thornn's Avatar

    I have an Iphone 4, 4.0.1, BB 01.59, locked to AT&T US (but I'm using another carrier). And everytime i reboot the phone there is a problem with the unlock: the phone shows one network bar, or no service, "invalid sim" and "sim failure". It usually works after restaring the phone acouple of times.

    But today i can't fix it, i have tried everthing, Removing/reinserting SIM, rebooting multiple times, resetting network settings, or resintalling ultrasn0w. How do I fix this?
    2011-12-22 03:33 PM
  2. daytonaviolet's Avatar
    perhaps its the sim tray issue? try covering the square notch of the sim tray with a very thin piece of tape. often times the release pin will short out to the sim tray notch. the sim tray is metal and shorts to the sim card. i've done this and the problem never came back.
    2011-12-23 12:04 AM
  3. thornn's Avatar
    Thx man, Problem solved
    2011-12-23 01:27 AM