could you please tell me what phobos are on our iphone 5 there are so msny in his deleted history .sometimes they have 3 or 4 numbers in front of them.

Hi my husband has iphone 5 and has so many phobos on his deleted history.they can either have 3 or 4 numbers in front of them.are they certain websites or are they down loaded picture messages.please help as i would like to know why so many are on his deleted history when he has only had the phone 5 months.i can send a sample of 1 with a number infront of it if that would help at all