The most plainly obvious course of action is to call a locksmith. You examine the phone. While it appears to be hooked up to an active phone line, the rotary dial and receiver cord are both missing. You won't be talking to anyone on this phone!
Hey check it out. Every week we'll be revealing some new troll characters from Hiveswap until Act 2 is out. Follow the Troll Call here, and meet the first two here. Expect a few more surprises like this to drop in coming weeks.