unlocked iphone 4s reads sim not valid

Discussion in 'iPhone Tips, Help and Troubleshooting' started by atillasirin, Feb 17, 2012.

  1. atillasirin macrumors newbie

    Feb 17, 2012
    hi guys,i am new to this iphone unlocking stuff.i would appreciate it if someone helped me out.i bought a iphone 4s from this guy which he said it was unlocked.when i went to pick up the phone i checked the iphone out and he had tmobile service on it.i had bought a att micro sim card and a tmobile sim card which both of them was prepaid.since i knew the phone worked on tmobile because he already had service with it i put in the att sim card and it worked with both.i even hooked it up to itunes and it recognized it as a iphone 4s.but when i got home i tried putting in the tmobile sim card it says sim not valid.i thought the sim was damaged and got another one from tmobile it still says invalid.does anyone have any suggetions.THANKS!!! it gets signal on it with up to 4 bars when tmobile sim card is in.it is version 5.0.1 (9a405) and the modem firmware is 1.0.13.model number of the iphone 4s is MC924LL.Thanks again.
  2. kalex macrumors 65816

    Oct 1, 2007
  3. bandofbrothers macrumors 601


    Oct 14, 2007
    Hope its not been imei locked by the Network!!

    Just a thought :confused:
  4. atillasirin thread starter macrumors newbie

    Feb 17, 2012
    sim not valid

    how can it be locked by the network if it factory unlocked?what can i do if it is locked by the network.will they ask for receipt or ask where i bought it? when i brought it home it had the att sim card in it and i sync it with i tunes.you think that caused the problem?thanks
  5. Dviper27 macrumors member

    Feb 18, 2012
    Take it to TMobile and see what they have to say about it

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