It's good to see competition heating up in the mobile carrier space.  Yesterday, AT&T announced its "A-List" feature, which gives you free unlimited calls to/from your 5 favorite numbers.  Today, Sprint is launching its "Any Mobile" feature.  The feature is free for any plan that includes an "Everything Data Plan" and gives you unlimited calls to any mobile number regardless of which network the other caller is on.  This is a significant upgrade from the standard mobile to mobile minutes that are included in most plans.  Because you're not restricted to calling people on the Sprint network, you can finally call your friends on AT&T and Verizon without draining your monthly minute balance. 

Click through to Sprint to see if you're eligible.