Yesterday there were rumblings that Sprint initiated about their releasing a revolutionary service today. They just announced it and while it does not blow your mind it is interesting. Most carriers, including AT&T now, allow you to call 5 numbers free. The only exclusion left is Sprint since they do not offer such a option.
Now they have just released Any Mobile Anytime which gives you free calls to any domestic mobile phone on plans starting at $69.99/month. The nice part is that the plans unlimited data includes BIS email. Also make sure to read the fine print on the bottom of the page before signing up.
Check out the details at anymobileanytime.sprint.com