I recently bought an iphone 1.1.2 and unlocked it out of the box using turbosim. With T-Mobile USA it worked perfectly, but i installed a Colombian Comcel active SIM card, and changes the iWorld setting to colombia ad it said no service. That card should have been able to roam here in the USA.

I travel to colombia a lot and I want to know how to fix this, or find out if that is how it is supposed to work.

Than you in advance