upgraded iPhone 4 to 4S.. tell AT&T to update IMEI?

Discussion in 'iPhone' started by unlimitedx, Oct 17, 2011.

  1. unlimitedx macrumors 6502a

    Jun 15, 2010
    I used another line in my family plan for my upgrade to the 4S. I just plugged in my sim card from the iphone 4 to the iphone 4s. Do I need to call at&t and tell them to update the IMEI in their system? (not auto detected by at&t?)
  2. sb1805 macrumors newbie

    Jun 12, 2009
    It couldn't hurt. I just did the same thing. There's talk that updating the IMEI allows you to select the new 4S data plans, which supposedly are required for the new HSPA+ speeds.

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