CDMA has the carrier’s information they want you to use the phone on stored in the phone’s programming, whereas GSM phones have a semi-universal software security lock placed on the SIM card slot that tells the phone what SIM card is allowed to be used.īecause of this, GSM phones can be unlocked using a passcode that the manufacturer has (or that can be generated using a keygen similar to a keygen for a hacked cd rom for your computer). The main difference you need to know is that GSM uses a SIM card, and CDMA does not. Now, I won’t get into the differences between the two technologies in detail here as this is mainly focusing on how one must go about unlocking each of these technologies, we’ll save that for another post… Here in the US though, it’s about 50% CDMA and 50% GSM (one of the only countries to have such a high use of CDMA technology).

While the majority of the world uses GSM, there are a few CDMA carriers scattered around the world. Your average user doesn’t know that there are two major different technologies used for cell phones in the world CDMA and GSM.

Metropcs universal sim card hack