Can they Block a Cellular Connection from Crossing a Country Border

I was in Lome, Togo less than one mile from the city of Aflao, Ghana and it tells me my MTM Modem is roaming and will not function, MTN is not in Togo.

With my BlackBerry, I can chose a specific signal, and I believe I am able to tap into the Ghana MTN signal. However, I also have a MN USB Wireless Internet Modem, it says it is roaming, this is mysterious.

Sat, 22 Jan 2011 11:15:22