The Samsung Gravity Q comes with a 3 inch screen, larger than the 2.8 inch glass on the Samsung Gravity T. The featurephone has a 2MP rear-facing camera, a 1000mAh battery and an FM radio. A 32GB capacity microSD slot is aboard and the phone features 3G connectivity on T-Mobile's pipeline.
This would be a good handset for the kids, especially with the QWERTY keyboard which makes it much easier to send out perfectly composed text messages. Or, if you need a back up phone for one reason or another, this could be a good choice.
source: T-Mobile, Samsung via PhoneScoop