If you have a gmail account (I assume if you have an android phone you do

) you can text phone numbers. I find gmail works the best with this, but others should work. You need to know the suffix of the carrier you are trying to send a text to.
For instance, if you are "emailing" a text to an AT&T subscriber, you send "to" their 10-digit phone number, and for at&t the suffix is @txt.att.net, or @mms.mycingular.com.
So you would send to (10-digit number)@txt.att.net
This way, people can reply to your message.
Hint, if you send as a text, chances are the person who receives it will see it coming from a random number so you may need to let them know it is you texting them. If you send as an MMS they will see your email address as "from". Make sure they have unlimited txt and pics or MMS might cost extra.
I do this at work when I need to text people because I have no cell service in my building.
