Why won't my calls/texts go through to an iPhone?

I'm trying to text my boyfriend and when I try to FaceTime him, it will ring but regular calls go straight to voicemail and my texts don't say delivered.

Hm connection

First, what version of iPhone are you using, iPhone 4/5/6/7 etc? Second is that most of the time why facetime doesn't work is because you either don't have a data plan, facetime requires internet connection, most of the time iPhone users uses facetime when it's connected to a Wi-Fi! It could also be a connection problem like try to reboot your phone or go to settings and try resetting mobile connection settings!

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