The short of it is this. I HAVE gotten an unlock code (from AT&T) and unlocked the samsung sgh-a237, and confirmed that is unlocked. When I put in the nextel Sim card in it shows the information on it but will NOT connect to the network... Under networks it shows only AT&T and T-Mobile. I'm a pretty tech savy guy what do I need to get this on Nextel. I'm doing it for a friend and he doesn't want to spend money for a new phone. Thank you.