IPhone 3G includes a communication device (especially a mobile phone) that supports multiple radio frequency bands called tri-band UMTS/HSDPA.
IPhone 3G . 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 ( including dual-band , tri-band , quad-band and penta-band devices ) is a communication device ( especially a mobile phone ) that supports multiple radio frequency bands .