cannot text message from apple iphone-not authenticating

Hello -my wife has a apple i phone and - when she had it set up at the apple store- she told the guy ( not sure this matters) that she never sends text messages-
Well now she wants to-
-we put the tel phone # in - write message and send it - but then has the error that it's not sent-
when I look at settings- and messages- I see it is trying to authenticate- but cannot-
any ideas of what the problem is?
wife noticed- we have email in phone - but not a telephone number-
thank you
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Scott CConnect With a Mentor Senior Systems EnginerCommented:
I use this all of the time and it works great.

It just uses whatever internet connection you have.
Timothy McCartneyConnect With a Mentor SYS ADMINISTR I INFRASCommented:
Have you contacted your service provider to make sure texting is enabled on the account?
davetoughAuthor Commented:
I have not checked if this is enabled- I may have incorrectly assumed it is -
I will check out free app
thank you-
i will get back
davetoughAuthor Commented:
now have a pc problem- will post back when I resolve issue- thanks
Timothy McCartneySYS ADMINISTR I INFRASCommented:
I see... I'll keep monitoring this question for when you post back if you need further help.
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