Here's the thing. I have unlimited data plan and if I renew my contract I will lose it. so a friend of mine offers me a samsung galaxy s3 that is unlucked and I want to confirm it would work with just removing my card from my thunderbolt and put it on the galaxy s3. Is it possible?
any advice will be very appreciated it.
Activation of a phone only requires a SIM card in the phone which you want to activate. You wouldn't need to swap SIM cards in this case. The only time you might want to swap SIM cards would be if you had 2 active phones under the same contract and you wanted to swap phones without doing anything other than powering off the phone.
In the case of activating an unused phone, the unused phone would be activated using it's own SIM or a new SIM if the phone doesn't have a SIM - everything is done through the network's software. You can go to the VZ Store to have this done, or you can activate a phone yourself by following the instructions in the VZ Site which you can find under My Verizon, Active or Switch Device.
Unlocked GSM phones only work on other GSM networks. In the US, your choices are T-Mobile, AT&T and their MVNOs. With Verizon Wireless voice, text messages and 3G data go over the CDMA network. This means that a GSM phone (such as your friend's Samsung Galaxy S III) will not be able to make calls or send text messages on Verizon Wireless.
What a great friend! The Samsung Galaxy III and the HTC Thunderbolt have different sim cards. Your Thunderbolt takes a standard sim, while the Galaxy takes a micro sim. You are able to go to one of our Corporate locations and have the sim card replaced and the Galaxy activated. The good news is that you are able to retain your Unlimited data because you are bringing your own device. To find the nearest Corporate location, please click on this link: http://bit.ly/3SdsA
Please follow us on Twitter at @vzwsupport