While I'm a long way from this situation with my kids, but a couple girlfriends of mine allowed their teens to sleep with their phones in the bedrooms. I would make the teen charge and keep phone in a central space like kitchen or den, etc vs in their own rooms. Also don't encourage phone to double as their alarm system to wake up, get a stand alone alarm for that reason to keep in their rooms. It takes away the I need my phone to wake up argument.
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Mummy to DS1-6/11 and DS2-1/14