what is up with my friend's phone?

I just brought an iphone I downloaded all my contacts. it tells me the type of mobile phone everyone has. when I get to my friend's number and it says his number is connected to an iphone, however when I asked him if he had another phone or was on his daughter's plan, he explained with an attitude that he is a single man who has always taken care of his own responsibilities and don't need his kids to take care of him, and just because I have an iphone don't mean everyone has one. The other problem is everytime I try to call him it says the mailbox is full and he can't recieve calls. His response is that he dosen't know what is wrong with his phone, that's been happening to him a lot lately. WHAT DOES ALL THIS MEAN?

P.S. the problem that I'm having is, when he's with me, the only phone he has with him is a samsung