I've been calling different numbers (all my own or my girlfriend/friends) and it worked once on her home line, but hasn't since the first. It generally works when I have it call any of our cell phones though.
I only say drink diet soda, because if you're accustomed to drinking a lot of soda, switching to diet is much better than continuing to drink regular soda
btw, does it really cause hunger? I've never noticed that personally.
Also, people keep saying not to work on building muscle, but that may actually be a good idea, the more muscle mass you have, the more calories you burn, so if you do a combination of exercises like running and lifting, you might lose weight faster.
Then again, none of us (as far as I know) are doctors, so maybe you should ask one, lol?