Device Guides

Apple iPhone 4S

Change device
iOS 9.0
iOS8
iOS5
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.
Change device
Buy now

Search in Apple iPhone 4S

How to
Troubleshoot
Using apps
Specs

I can't turn on my mobile phone

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

Apple iPhone 4S (iOS8)
Apple iPhone 4S (iOS8)

We found 10 possible causes:

  1. Your mobile phone isn't turned on correctly
  2. Your mobile phone is locked to Optus
  3. Your mobile phone is locked to another service provider
  4. You're asked to key in your PUK
  5. Your SIM is blocked
  6. An incorrect PIN is entered
  7. Your SIM is faulty
  8. The battery is flat
  9. Your mobile phone isn't assembled correctly
  10. The phone lock code is turned on
Start guide
Email this guide

Would you like information for your {device-name}?

Yes No

Would you like

Information for one of these devices?

No thanks