Originally Posted by DrTacoElf
Can you please elaborate...
Tmobile uses 1900Mhz band for GSM coverage in US.
Cingular uses both 850Mhz and 1900Mhz for GSM coverage.
You will be severely hampered in the coverage you receive with Cingular if you use a device that does not have the 850Mhz GSM band, such as the 7230.
Some areas of the country are still OK on 1900MHz devices, but I wouldn't recommend it. You could lose coverage down the road.