You are very correct sir, I have heard about this by calling the number back and pressing 1 to be removed is what THEY WANT YOU TO DO so they can get into your phone and info, contacts, ect.

It's just like everyone has said, I didn't answer and they left no message. I called to number back and all it said was " to have your number  removed press 1. I didn't. I have heard of this before. When you press 1, they are able to get into your cell and get your information like  Contacts,  addresses,  Credit card information if you have the wallet app like I do on my iPhone. BUT if you have a iPhone you can press the "i" to the right of the number and scroll all the way to the bottom and press BLOCK THIS CALLER. But if you don't have the iPhone, I like the idea of saving it as " junk " in your contacts! This is the first day I have ever got a call from this number and it called 3 times in 2 hours!! But not anymore! BLOCK!