I've noticed something odd on my Sprint HTC One. Whenever I decline or miss a call, there is one entry for the call in the call history, and then immediately above it will be an "Unknown" entry with NO phone number, same time, which has the outgoing arrow next to it (as opposed to incoming). Is this some sort of a glitch, or maybe something to do with voicemail (happens when I use either Google Voice or Sprint for voicemail)? Anyone else notice this? Thanks.