Is it possible to use a Verizon iPhone 4S on another US carrier, such as GSM AT&T or T-mobile or CDMA Sprint, etc? And why if not?
Assuming the devices has been legitimately unlocked via the procedures mentioned in Verizon iPhone 4S SIM UNLOCK Tutorial?
Verizon has confirmed (here and here) they WILL unlock the SIM on the iPhone 4S, allowing for use of local SIM cards while traveling abroad (no word yet on whether this will allow for use on AT&T and T-Mobile.) This is different than the jailbreak unlocking method; SIM unlocking through Verizon is permanent and will not affect your warranty in any way.
Meet the following requirements:
- Must be a Verizon Wireless customer.
- The iPhone 4S being unlocked must be active on a Verizon Wireless line of service.
- The line of service must be active at least 60 days.
- The line of service must be in good standing for the past 60 days.
- Only one SIM Unlock per line every 10 months.
If you don't meet one or more of the above requirements, call anyway. You may still get lucky.
Insert a foreign SIM into the SIM card slot on the side of your phone (only required to confirm that the unlock is successful.)
Call 1-800-711-8300 (Verizon Global Support) and ask the representative for a SIM unlock. Occassionally a representative may not know exactly what you are referring to; make sure you are not transferred to a different department. You are in the right place. Explain that they should have a walkthrough on how to do this, and that it allows for the use of local, non-Verizon SIM cards while traveling abroad.
Get confirmation from the rep that the unlock has been applied to your account, then check your phone to make sure it recognizes your SIM and can connect (if successful it will roam on AT&T, assuming you are calling from the USA.) You will NOT see an unlock confirmation in iTunes as that is for a factory-applied unlock only.
Enjoy your new unlocked iPhone 4S!
However it seems that this unlock mentioned above is only for Internationale SIM cards for use outside of the US. Can this be done in the US, really looking for other carrier options with my existing phone.