Device Guides

Apple iPhone 4S

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iOS is the operating system software installed on your iPhone. To find out which version you have: Tap Settings, Tap General, Tap About, and view the version number.
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I can't make voice calls

This troubleshooting guide will take you through a number of possible causes
to help you find a solution to your problem.

We found 10 possible causes:

  1. Not adequate network coverage
  2. There's a temporary network problem
  3. There's an error at the receiving end
  4. The selected network is out of range
  5. Roaming isn't activated in your rate plan
  6. There's no credit on your prepaid phone card
  7. Your number has been suspended
  8. Flight mode is turned on
  9. Your mobile phone is overloaded for unknown reasons
  10. Your SIM is faulty
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