I am going to pay the remaining amount on my tab so I can upgrade. then I want a $150 phone and with my tab i am on im aloud to put $150 towards a new phone. so the phone will be free. am I aloud to do this?
Yup, Moto G is a tough phone to beat on Tab S for $0 down. The Desire 601 is also an underrated device that is $50 on Tab S ($0 if you come to Mobile Shop) with nice front speakers, good performance, battery life, and it has LTE, a removable battery, and expandable storage unlike the Moto G. It's a cheaper S III, really.
As for the other devices, the S III is a good choice for $0 down on Tab M as is the iPhone 4S 8GB.