Sony Ericsson is coming back to T-Mobile USA and they’re the first HSDPA handset to launch, too. The Sony Ericsson TM506 will be available to T-Mobile in two colour schemes.

T-Mobile has confirmed that their upcoming Sony Ericsson TM506 Bella will indeed be launching with a dual-band (1700/2100Mhz) 3G radio to pull down wireless data at near-broadband speeds. The slim and stylish clamshell is expected to deliver 9.5 hours worth of talk time on GSM networks, with 3G calling good for 3.5 hours. The official launch brings along confirmed support for AWS 3G protocol.

The Bella, that’s how it is known internally, although, doesn’t have incredible specs however they’ll do just fine for an average phone. Here’s a recap of the specifications:

• 2.0 megapixel camera
• Tri-band 850/1800/1900 GSM/GPRS/EDGE (boo!)
• Dual-band UMTS/HSDPA 1700/2100
• Bluetooth 2.0 with A2DP
• microSD slot
• Video recording
• IM

Inquisitively, pricing information is still not available.