BlackBerry Tour 9630 smartphone uses -True Global Roaming: 800/1900MHZ CDMA, 2100 MHz HSPA, Quad Band Edge.iF you are in international roaming area using CDMA technology.you should be able to send and receive text messages. For more info on Internation Roaming contact :-
Sprint World Wide (SWW) handles International Long Distance Calling – activations and troubleshooting the ability to place calls to international countries while in the U.S or International Roaming which is for use while roaming in an international location.
For International Long Distance Calling - Dial 888.226.7212, option 1.
For International Roaming – Dial 888.226.7212, option 2.
For Technical Support – Dial 888-226-7212, option 3.