Boyfriends mobile won't recieve any calls or messages?

Hi,
Me and my boyfriend are stumped and I can't find a solution anywhere on the net..

We are not sure why but i sent him a msg the other day and when i asked him i he had recieved it he said no. I sent him another.. and no again.

So i tried calling him and it said "this person can not recieve calls right now"

He tried calling it from his house phone and he got the same message.

we left it and i've tried again today and now it says " this person is not recieveing calls right now, we can send one free text when they are recieveing calls again... Press 1 to send free msg."

Does anyone know why/what this is?

Thanks