1. iMore Question's Avatar
    i update my iphone4s ios 6.0.1 to 7.1.1
    error sim card invalid
    05-04-2014 03:46 PM
  2. iOS Gravity's Avatar
    Have you tried restoring via iTunes or taking the sim out and putting it back in again?
    05-04-2014 04:00 PM
  3. Highrisedrifter's Avatar
    I had the same issues with my iPad 2 and removing, gently cleaning and reinserting the sim card sorted it out.

    Sometimes, putting the phone into Airplane Mode and out again an kick start the sim too.
    05-04-2014 05:06 PM

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