I need help.
I have PAntech crossover800. The sim is unlocked. I can use the phone to call with my new provider (Non AT&T). But I cant use it with any 3G, GSM network. I am unable to edit the apn settings atall. After I select, access point names, AT&T WAP (wap.cingular) and AT&T (broadband) comes where the first one was pre-selected (green). When I open it to change the setting, I see the apn fields are greyed out. There is an edit apn button, this button does not function.

I have a unlock code. But I am not sure how to use it. Please help.