have iphone 4s did the upgrade 9.1 and now phone won't call out or receive phone calls

+1 vote
asked Nov 25, 2015 by Marilyn

1 Answer

0 votes
answered Nov 25, 2015 by ihelpadmin (19,980 points)
Best answer

Here are the tips to try to fix this issue:

  1. Reset network settings.
  2. Check date & time.
  3. Activate / Deactivate Airplane mode.
  4. Check if the sim card is active.
  5. Do a fresh installation of the iOS 9.1 firmware.
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