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 .	UMTS	Universal Mobile Telecommunications System	HSDPA	High-Speed Downlink Packet Access	iPhone	iPhone	GPS	GPS	3G	3G	tri-band	multi-band
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 .	telecommunications	telecommunications	mobile phone	mobile phone	radio frequency	radio frequency
