Test driving an app isn't entirely unheard of -- Apple introduced its lackluster "Try Before You Buy" system last summer and the Android Market's got a 15-minute return policy. Now T-Mobile's teamed up with mobile gaming outfit WildTangent to bring a novel approach to looking under the hood of gaming apps: rentals. The partnership promises to bring 25 cent game rentals to your phone or tablet (considering your a T-Mo faithful rocking an Android device), giving you the opportunity to see what a particular game is working with before you commit. The new service also
