AFAIK, Verizon somehow locks the phones so that the GSM radio can't be used in the US (on AT&T or T-Mobile's networks). But they recently signed an agreement with the FCC in the US when they bought some new spectrum band that they would unlock the GSM radios on the iPhones.
This update apparently unlocks the GSM radio on the GSIII so that it can be used overseas (at least for some GSM networks - they might need an agreement with Verizon and you might need to be on Verizon's international roaming plan, I dunno).
Verizon was notorious for years in locking their phones so that you would have to do things like buy ringtones from them if you wanted to change it on your phone. They seem to be doing less of that now, but one still needs to be careful.
http://www.pocketabl...e-bootloader.html
As great as it would be if Verizon had reversed their policy on locked bootloaders, that is not the case. Instead, the episode boils down to some confusion about the meaning of Âunlocked. What the Verizon representatives in the email and chat were referring to is not an update that will unlock the bootloader, but instead an update that will unlock the global GSM roaming capability built into the Galaxy SIII. With unlocked GSM roaming, users will be able to put a SIM card into the Verizon SIII and use it on most GSM carriers worldwide. It certainly isnÂt the same as an unlocked bootloader, but it isnÂt a bad update either.
Although it may disappoint those who were looking for an unlocked bootloader, unlocked GSM roaming is a nice feature to have, especially on a CDMA Verizon smartphone. Of course, it will be of little consolation to those with the SIII who wanted an unlocked bootloader, but it is a nice feature for those looking at the device. Going back to the communication error, this incident shows that rumors may not always be true, even when supposedly confirmed by employees or leaked documents. It also highlights the confusion over what Âunlocked actually means with regards to smartphones, but that is another topic entirely.
HTH a little.
Cheers,
Scott.