Actualy there is a very easy way to do the TMobile Fave5 (Or for Sprint get Sprint to Home)
You can test out what I say on a free trial. Go to
VoiceStick.com - The Internet Phone for cheap local and long distance calling and sign up for the free Next to Nothing program. You will get a welcome letter, it has an express code. That code gives you a free $5 credit to use like cash.
Voicestick has call forward which will give you free incoming minute (They have no charge for incoming) AND the BIG THING is that they have the reverse of call forward, they have a web bridge.
Just register your cell number in the bridge, and make it one of your Fave5 (or Sprint to Home) numbers.
Now just predial your voice stick number and you will get a fresh dial tone. Make all the out calls you want for 2 cents a min (Or an unlimited for $19 a month)
So you get to try a free incoming number, and voice mail with no start up or termination fee and get $5 to try the out call.
The only catch is you need Pay Pal or a CC which they use to id you and limit you to one free account. They don't charge the card.
I have been doing this for months!!