We are switching BFs son onto our phone plan with t-mobile. He does need band 12 because of where he lives. Any phone suggestions? Looking for an older model. Durable is a plus, but we can always get a case for that. Any suggestions? Not sure if a t-mobile branded device might be easier for child monitoring stuff? Or will it function the same as an unlocked phone? Hoping to spend a good chunk less than $300, but I'm having trouble finding the b12 requirement. We are both using Nexus 6s, but the kid probably doesn't need anything that big! Any help would be very appreciated!