The Sony Ericsson P910a /at&twireless is more than a mobile phone. It is almost a mobile office, with push email ready. This cell phone is equipped with a digital and video VGA camera, keyboard inside flip and a sharp and bright 262K color screen.

This phone also has:
Wireless connection - Bluetooth™
MMS with pictures, sounds or video
Fully featured keyboard on the back of the flip for easy text input
Polyphonic ringtones, 24 are included.

Accessories included are:
lithium ion polymer battery - compact wall charger - holster - desktop stand - 32MB memory card.

Characteristics are:
Phone Colors: Gray
Dimensions (H x W x D): 4.5 x 2.3 x 1.0 in
Weight (w/standard battery): 5.5 oz
Technology: GSM 850/1800/1900; GPRS; TriMode
Talk time: Up to 780 mins, Standby time: Up to 400 hrs.
Additional features are:
Photo Caller ID Capable - Downloadable games / applications - IR Port - Phone Book Capacity: shared memory - Vibrating Alert - Voice-Activated Dialing - Display: 262,000 colors, 208 x 320 pixels - Language options: English, Spanish, French, Portuguese - Wireless Web Browsing Capable - Text Messaging Capable - Java-Enabled - Games.
The phone doesn't feature a mp3 player or FM Radio.
(mentioned services are subscription dependent)

With this phone you might consider the AT&T GSM America National $39.99 (GSM) rate plan, featuring:
450 Anytime Minutes - Unlimited Night and Weekend Minutes - Domestic Long Distance and Free Roaming and includes: Voice Mail, Numeric Paging, Domestic Long Distance, Caller ID, Call Waiting, and Detailed Billing.

Sony Ericsson W580i Cell Phone AT&T Specs, Prices, Reviews

Nokia 6620 (AT&TWireless) Smartphone

Smartphone PalmOne Treo 600 (AT&TWireless)

Here's more on ATT Family Plans

att and cingular merger