- Maximum message length: 160 characters
- What happens to longer messages: They're broken into 160-character segments and delivered piece by piece.
- Cost per message: 20 cents each to send or receive (or less, if you sign up for a text messaging package); messages sent to international numbers cost 25 cents each
More information: AT&T text messaging
Sending email to an AT&T phone: Use the address format firstname.lastname@example.org. Example: email@example.com
Notes: The address for sending pictures -- assuming you have an MMS-compatible phone -- is firstname.lastname@example.org.
You can check with AT&T customer service (dial 611 on your mobile phone) if you have questions about rate plans or if you have problems with your SMS service (e.g. you're getting unwanted messages).