OP here, wow I can't believe this actually got posted. I want to say thank you for the kind words, it was deffinatly nerve racking. To clear some things up, no we did not call the cops. The reason is once I heard the phone go off I woke up my mom and she turned on all the outside lights scaring whoever it was off. (I could tell because their phone went off again but that time the sound was farther away) Also I could tell it was a cell phone from how close it was and ring tones are easy to recognize. For the people saying it could be someone passing through, I highly doubt it since my back yard is fenced and my neighbors are not close together at all. However we are thinking it might be just some teenagers, since when housing construction was going on across the road from us some teens snuck into the unfinished houses, so it could be just them. Thankfully though my parents lock up the gates to the back yard and have a motion sensor camera set up that sends a message to your phone when triggered. We also own 3 dogs, one of which is a great dane. He's a big baby but his bark sure is scary. We hope the person doesn't come back again, if they do we will be calling the cops. There has only ever been one break in the neighborhood and we hope to keep it that way.