Iphone 4s facetime not working?

Okay well whenever i try to facetime someone it doesn't stop connecting for like 5 min and never answers, i tried to restart my phone and also turn facetime on and off and facetime someone else in the the same room, never connected. Its not my connection either because i tried it in a bunch of different locations:/ what do i do?

Delete facetime and reinstall it again from the Apps store?

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