You can send a txt message to anyone who can receive txt messages on their phone or smartphone using your favorite email client – you just need to know the remote phone number along with the provider gateway information.
Here’s a few:
Verizon: 10digitphonenumber@vtext.com
AT&T: 10digitphonenumber@txt.att.net
Sprint: 10digitphonenumber@messaging.sprintpcs.com
T-Mobile: 10digitphonenumber@tmomail.net
Nextel: 10digitphonenumber@messaging.nextel.com
Cingular: 10digitphonenumber@cingularme.com
Virgin Mobile: 10digitphonenumber@vmobl.com
Alltel: 10digitphonenumber@message.alltel.com
CellularOne: 10digitphonenumber@mobile.celloneusa.com
Omnipoint: 10digitphonenumber@omnipointpcs.com
Qwest: 10digitphonenumber@qwestmp.com