Call ended straight after dialling

I bought 3 iphone 5 yesterday, with one board not even recognised by the pc, so this will be chucked.

2nd fails to install drivers, so assuming this is dead.

But the 3rd, powers up, wifi works, blue tooth, updated to recent IOS, recognises sim card, and gets signal. (Although the signal will drop off)

So with a known working sim card (the wifes) I tried to make a call, but almost instantly, I get "call failed"

Date and time is correct, I've power cycled, hard booted the phone. Reset network settings.

Now I tried turning on the caller ID, as I've seen this suggestion, but this always seems to be turned off when I go back into that option.

When I try to ring the phone from mine, I get the voice message saying "unable to connect at this time"

Anyone with more knowledge on this problem able to give some pointers please?

And if anyone does know about the drivers failed, that would, be awesome too!

Many Thanks

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