I dumped Sprint and switched to Verizon a couple months ago when I found out the VZN Galaxy S3 was going to be a "global" phone. I travel a lot to Mexico and Asia.
I have the latest firmware, 4.1.2. So I was about to go to Mexico and I went to a Verizon store and was told sorry, your phone can't be used internationally until you have been a customer for 6 months and then we will unlock it. And also, it will only work on CDMA networks, not GSM.
Then the next day I called Verizon customer support to ask again, and this time I was told that if I have the latest firmware then yes, the phone is already unlocked to global use and yes, it will work on GSM networks if I put a local SIM card in it. The exact opposite answers.
I went to Mexico last week, bought a Mexico SIM card (IUSACell provider, GSM 850/1900), put the SIM card in, turn the phone on, and it didn't work. Could not find or connect to any network. I sent about a half an hour going through the network settings but nothing worked.
Is there a Verizon employee on this forum that can can tell me: Is my phone unlocked for global use and does it work on GSM networks?
Here are the specs for the VZN Galaxy S3 that I found on the Verizon web site:
Network: LTE, CDMA/PCS/1xEVDO Rev. A (800/1900 MHz)
Apparently it doesn't work on GSM networks because it's not in the specification?