Currently Being ModeratedFeb 13, 2013 11:38 AM (in response to Sbrooks trini)
This was asked and answered successfully here: https://discussions.apple.com/message/21181454#21181454
Give it a try and see if it works.
Currently Being ModeratedFeb 13, 2013 11:57 AM (in response to Sbrooks trini)
Get a separate email address (gmail) to use for messages on your iPad.
Using FaceTime http://support.apple.com/kb/ht4319
Troubleshooting FaceTime http://support.apple.com/kb/TS3367
The Complete Guide to FaceTime + iMessage: Setup, Use, and Troubleshooting
Troubleshooting FaceTime and iMessage activation
Using FaceTime and iMessage behind a firewall
iOS: About Messages
Set up iMessage
Setting Up Multiple iOS Devices for iMessage and Facetime
FaceTime and iMessage not accepting Apple ID password
Unable to use FaceTime and iMessage with my apple ID
For non-Apple devices, check out the TextFree app https://itunes.apple.com/us/app/text-free-textfree-sms-real/id399355755?mt=8