The BlackBerry 8900 is the thinnest and lightest full-QWERTY BlackBerry smartphone yet. You can keep up with your contacts using a variety of instant message (IM) networks, including the integrated Blackberry Messenger as well as downloadable clients for Google Talk, Yahoo! Messenger, and Lotus Sametime. Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile; also compatible with GSM SIM cards like H20 and select prepaid carriers. Phone will not work with Sprint, Verizon, Boost Mobile, Virgin Wireless or other CDMA carriers. Please contact your carrier to confirm support of voice and data on this unlocked GSM device.