How to add people on iMessage?

So i have an iPod touch 4 gen and my friend has an iPhone 5. She gave me her number but it won't let me add her number. It keeps saying that its not registered with i message. What I'm i doing wrong?

Check if she has her iMessage turned on because it's saying that HER number isn't registerde.

Both of you need imessage on.

Are you sure your friend has properly registered her number to be used with iMessage? Check with that first.

Have you put her in your contacts
AND as an iPhone (not just a mobile) ?

and likewise, she needs to have used imessage once to someone.
eg to you.

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