You can actually use your email account to communicate with a cell phone. You just have to get your carrier tag. If you forgot your cell phone and want to talk to an AT&T phone, you can enter the 10-digit number in an email followed by: @txt.att.net. That's not for photos, however. To email-to-text a photograph, you'll have to use @mms.att.net for AT&T users. Rates and fees may apply.