Something else interesting: Free calls.
So, Sprint-to-Sprint calls are free. You can use this, along with a neat feature, to dial out while still in a Sprint-to-Sprint call.
1) Dial 11+any Sprint number. This is their feature to directly access someone's voicemail, for leaving a message without ringing them up. This counts as a Sprint-to-Sprint call and doesn't cost minutes.
2) Press **. This allows you to enter another voicemail number, to access your voicemail.
3) So, enter your number, then #, like the voice tells you to.
4) From there, follow Step 2 of the above guide.
Congratulations, now you can divert, without even paying for the call. Cheapass.
I wonder why Sprint allows you to dial out from checking your voicemail. Convenience? Like, if someone says "Hey it's John, call me back at 123-456-7890", you could press 8 and enter that number without pressing your phone's End key? I guess that's the case, but it seems kind of frivolous.
And it seems obvious, but I checked, and you can't use the "Voice Mail Place Call Feature" by calling your phone from a landine, ignoring the call so it goes to voicemail, then entering your password.
Also, I found a link with some relevant discussion:
http://www.binrev.com/forums/lofiversion/index.php?t22422.htmlApparently, YMMV on this.