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This sounds like something best resolved by having them hand over their phones during those times. Parental controls can only go so far because of emergency situations. You wouldn't want one of your daughters to not be able to use their device during that timeframe if an emergency situation appeared.
T-Mobile's backend isn't capable of restricting calls in the way you want. Apple could implement that into the OS but they more than likely never will due to liability reasons. Alternatively, you could buy a cell signal blocker and use that outside of their rooms as a way to ensure they are not calling or texting. This wouldn't block those functions going over WiFi though but you could also set your wireless home network to turn off during those times, depending on the type of router you are using.
ultimately the only way to control a child's cell phone use is to actually have the physical phone in your physical hand. you can put blocks and restrictions on through apps and through cell phone provider features but in the end if you can't trust your own children which is understandable you have to physically take the phone from them.
+1 To having the kids hand over the phone. I would also have them hand over the device unlock password.
FA can't do anything to iMessages and Facetime. Also against wifi it doesn't work. Best option is remove the device from their possession and give it back in the morning.