IPhone 3G includes a communication device (especially a mobile phone) that supports multiple radio frequency bands called tri-band UMTS/HSDPA.
The iPhone 3G is internally similar to its predecessor , but included several new hardware features , such as GPS , 3G data and tri-band UMTS/HSDPA.
In telecommunications , a multi-band device -LRB- including dual-band , tri-band , quad-band and penta-band devices -RRB- is a communication device -LRB- especially a mobile phone -RRB- that supports multiple radio frequency bands.
