AT&T:
Format: [10-digit mobile number]@txt.att.net
Example: 1234567890@txt.att.net
Verizon:
Format: [10-digit mobile number]@vtext.com
Example: 1234567890@vtext.com
T-Mobile:
Format: [10-digit mobile number]@tmomail.net
Example: 1234567890@tmomail.net
Sprint:
Format: [10-digit mobile number]@messaging.sprintpcs.com
Example: 1234567890@messaging.sprintpcs.com
US Cellular:
Format: [10-digit mobile number]@email.uscc.net
Example: 1234567890@email.uscc.net
