The phone number "is not registered with iMessage"

Right now I can't seem to send some text messages from my OS X. Here is a list of things I have done that will have caused the error:

• I fresh installed Yosemite about 2 days ago
• I updated my iPhone to 8.1 this afternoon
• I paired my device (I was able to send some texts from OS X)
• I fresh installed iOS 8.1 on my iPhone
• I can't send some text messages from my computer

When I start a new conversation on iMessage, the name of the person remains red. When I try to send a message I get a popup saying: " is not registered with iMessage". The handoff is well configured because I am able to see an icon appear in the dock when I use the notes app.

What can I do to make this functionality work again?

Thanks

Solution 1:

You need to wait for the iOS 8.1 update in order to be able to do SMS from your computer / iPad. It should be available for you now or tomorrow if you go to "settings -> general -> software update"

EDIT: "iPhone Settings -> Messages -> Text Message Forwarding" then select your device that you want to send from and enable it :)

Restart messages on OSX if it's still not working.

Solution 2:

Also check the OS X settings: Messages > Preferences > Accounts.

In my case the Messages app had disabled my AppleID account and enabled a new Google Jabber account.

Solution 3:

I had this issue, but quitting iMessage and relaunching iMessage fixed it.