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
iOS: FaceTime is 'Unable to verify email because it is in use'
Using FaceTime and iMessage behind a firewall
iOS: About Messages
Set up iMessage
iOS 6 and OS X Mountain Lion: Link your phone number and Apple ID for use with FaceTime and iMessage
How to Set Up & Use iMessage on iPhone, iPad, & iPod touch with iOS
Troubleshooting iMessage Issues: Some Useful Tips You Should Try
Setting Up Multiple iOS Devices for iMessage and Facetime
FaceTime and iMessage not accepting Apple ID password
FaceTime, Game Center, Messages: Troubleshooting sign in issues
Unable to use FaceTime and iMessage with my apple ID
How to Block Someone on FaceTime
My Facetime Doesn't Ring
Send an iMessage as a Text Message Instead with a Quick Tap & Hold
To send messages to non-Apple devices, check out the TextFree app https://itunes.apple.com/us/app/text-free-textfree-sms-real/id399355755?mt=8
How to Send SMS from iPad
You can check the status of the FaceTime/iMessage servers at this link.
If an iPad is on 3G, and gets service through a cellular carrier, shouldn't it text non iPhone users all the same? Especially if you have to pay a monthly service fee per device on your cellular network, and it's using cellular data?
(I don't have an iPad, so I'm not that familiar with that feature. But I wouldn't think if it's on a cellular network, it would be able to do it just like a cellphone).
Based on every person I've talked to, it's because since iOS7, SMS is turned off by default. That was not normal for previous versions. Rumor has it they're turning it off by default to get people to switch to iPhones.
," the problem is fixed.
Once you turn SMS on, or turn on the "Force sms if mms isn't available," the problem is fixed.
I find it odd that droids use MMS for Gchat/Hangouts, but they aren't compatible with iMessage. Isn't it time we stop dealing with proprietary formats or fake compatibility issues?