I'm currently traveling in Belize and am trying to get the iPhone 5 to connect to the local carrier (BTL), When I go into settings and switch automatic carrier to off, BTL is there and if I tap on it a check mark appears as if it has connected but yet I still get "No Service" in the top left corner, and can't use the network. Someone I'm travelling with is using the iPhone 4 and has no problem connecting to the network. Could it be the iPhone 5 is not compatible? Any other ideas?

Other Info:

Model No: MD296C/A (Unlocked)
Carrier: Bell
iOS: 6.1.2