Every time I receive a call from or make a call to somebody in my contacts list, when I check my call log afterwards there is a call listed from an unknown caller at the exact same time as the previous call. This results in an unknown caller always being at the top of my call log, which isn't a huge deal, but is kind of annoying. All my searches for the same problem I'm having turn up results about getting and/or blocking calls from unknown callers, but I am NOT actually getting these calls. Any ideas on what is causing this? Haven't rooted my phone or anything. Thanks! Edit: Downloaded the app Call History Manager, it's saying the contact name is "-1" and the calls are 5 hours long, regardless of the length of the call with a contact.