You can still text someone if your cell phone isn't charged. 

It’s true; most cell phone providers accept text messages sent via email when a special format email address is used.  If you type the phone number, plus the “@” symbol, followed by the cell phone provider’s mobile message domain, in the “To” field, a text message is sent!

Example: if your client has an iPhone (AT&T), and their number is 555-123-4567, you would type 5551234567@mms.att.net in the “To” field of your email program. And if they text you a reply - you get an email! (Note - the email may turn up in your "Junk" folder.)

Try it now using your cell phone! To get started, here is a list of some cell phone providers and their current text messaging domains:

Alltel = @message.alltel.com
AT&T = @mms.att.net
Nextel = @messaging.nextel.com
Sprint = @messaging.sprintpcs.com
SunCom = @tms.suncom.com
T-Mobile = @tmomail.net
VoiceStream = @voicestream.net
Verizon = @vtext.com (text only)
or @vzwpix.com (pictures and videos)