Didn't see that coming

A bold knock at the door and I got distracted. Through the window, I saw two boys standing I had never met before. Since I wanted to carry on the discussion I was in, I asked them without opening up why they were there in a changed voice relying on my hunch about them with the intention to meet me. One of them asked my cell number that I told. As I was telling, he wasn’t saving but dialing. As the dial was over, the cell phone being coincidentally in my pocket started ringing loud enough and they got me.