[Rourke Swift]

1. It sounds like the guy you talked to is clueless. Nex-Tech is a CDMA network (I think) and the rate plans I saw include MMS, so it seems kinda obvious the guy was just trying to punt you.

2. Very simply, the difference between GSM and CDMA is the method in which the cell signal is modulated, and different carriers use different methods. You can usually tell by things such as the branding, the data connection type, the presence of a SIM card, etc.

3. Many of the tweaks you see around here are more related to the operating system and the phone itself than the cell technology behind it. Those tweaks are relatively harmless and can almost always be fixed. Bigger things, like unlocking and flashing, are dependent on your carrier type, and it's very important you select the right one.

Is there a Nex-Tech logo when you boot your phone, or a different carrier's logo?