Currently Being ModeratedJan 16, 2013 1:36 PM (in response to Dawnie54)
Are you trying to message another Apple device?
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
Currently Being ModeratedJul 10, 2013 6:13 AM (in response to Texas Mac Man)
My daughter and I are both signed up for iMessage and have been texting via my iPad 3 for months. Suddenly, I am receiving Message Send Failure errors on my iPad, but my iPhone is still receiving her texts just fine. May I ask if you have any suggestions or solutions?
Currently Being ModeratedJul 10, 2013 6:17 AM (in response to NoDenverFan)
Try to deactivate imessage, then reboot and reactivate imessage, after that, you may reboot again!
Sometimes it's a bit buggy when using imessage on multiple devices!