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That is only an issue if the iPad has cellular. Also, I didn't think they could block it when connected to wifi?
I thought FaceTime was excluded from phones sold in certain countries. I thought Apple actually made those without the feature. If I'm right, then that phone was purchased in a country that allows FaceTime. I'm not sure about the carrier. If FaceTime is forbidden in your country, I would expect it would not work on Cellular nor wifi.
Sent from my ancient but trustworthy iPhone 5