First check and see if you phone is locked.
Go to Options --> Advanced Options --> SIM Card
In this menu, press the keys to spell "meppd".
More information should appear and the entry for "Network" should say "Disabled". If it say "Active" it's not unlocked.
Steps to unlock:
Prerequisite: unlock code
1) Settings > Advanced Options > Sim Card.
2) In the SIM Card menu, press
meppd
3) You'll see the unlocking level screen there you type
mepp2
*You won't see any text while you are typing either one of these.
4) Enter the unlock code.(this depends on your provider!)
YOU ONLY HAVE 10 CHANCES TO ENTER THIS CORRECTLY > enter unlock code and press track ball phone should shut off and reboot.
How to get unlock code:
1) call provider and beg/lie (don't recommend that) or
2) pay for unlocking service.
Unlock to Talk
3) Or try these codes
here.
Your unlock code could be unique to your provider.