Let me guess....either something naughty or something bloody? 
Well.......
We'll start with the theme, which was 'old hang ups'. Yes, it could be phone related. It could also be something that you can't move on from. Example: "low self-esteem is only one of his many hang-ups"
So I was thinking of that second definition of "hang ups" for some reason. The first word I found was "switch". The second word I found was "receiver". Both of those could have sexual meanings, and my eyebrow raised up!

but then I found the word "ringer" and realized it was about the phone.
