All iPads FaceTime with data only number

I don't think that is possible. Why not just use her Apple ID?

 

I don't see how that is any more convenient. FaceTime is pretty simple, open the app and touch a contact name. The process would be the same with the Apple ID or a phone number.

 

They can't use the iPad natively for normal calls. If they don't actually need data on it, might as well just cancel the data plan instead of wasting money every month.

 

It is my understanding that the "phone number" associated with the iPad is just for tracking the account. It is not the same as a voice plan.

As some one else said, I would cancel the data if they don't intend to use it.

 

What's the point of using the number for FaceTime/iMessage when the Apple ID works just as well? It's not like you have voice or SMS fallback anyhow. That said, iOS doesn't give you the option of using the iPad's number for FaceTime or iMessage.

 

FaceTime also only works with other iOS devices. If she wants to use the iPad to communicate with non-iOS devices she can use another app like Skype.

 

The iPad isn't enabled for phone use, so the phone number can'tbe used for voice calls. Addiaitonally, there's no guarantee that the phone will be permanent. The number is assigned only for compatibility with legacy method that GSM and UMTS uses for assigning data circuits. Over time, this could go away, and the number could go with it.