Can't make or recieve calls on iphone 4s, get modem/fax sound

Yesterday afternoon, I received a call and when I answered it, it was a loud modem/fax sound. So, I hung up and the person tried calling again and the same thing happened. I figured it was something on that person's end or just a glitch. I just let it go, and I didn't try making any calls until way later that night, which was succesful, by the way.
Today, I recieved a call, and the same thing happened. Around the same time yesterday afternoon. 24 hours later. I tried calling that person back and I got the loud modem/fax sound again. I tried calling a different number of theirs. Same thing.
I rebooted the phone and when I clicked the number to dial out, nothing happened. It wouldn't register that I was trying to make a call for at least three or four minutes after reboot. I was eventually able to call out.
Do you think the reboot helped and/or fixed the problem? Or will this happen again? If so, what could it be that is causing this?

Thanks for all those that have offered suggestions and advice. I now know what the cause of the problem is...
Apparently my phone has been 'blacklisted' by T-Mobile. They openly admit that they recognise the phone as being registered to me and owned by me as new. So they or myself can't understand why this has happened. They would have been quite happy to replace it but it wasn't actually purchased from them so now I have to battle with the Carphone Warehouse to get it replaced.
I'll be demanding some compensation for sure.

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