This is something I came across that could be of use. If you want to send a text message to someone’s phone here is the states and you know what provider they use all need to do is to send an email to one of the following addresses (change 1235556789 to the desired phone number):

Cingular: 1235556789@mobile.mycingular.com T-Mobile: 1235556789@tmomail.net Verizon: 1235556789@vtext.com MetroPCS: 1235556789@mymetropcs.com Sprint: 1235556789@messaging.sprintpcs.com Virgin Mobile: 1235556789@vmobl.com Nextel: 1235556789@messaging.nextel.com