I I had teenage foster kids and rules were similar they were allowed phone in rooms but no calls after 830 pm and phones off at 9 pm. I never brought credit their pocket money had to pay for credit. All laptops were in communal areas. They did not have access to the wi fi either so using their phone for Internet would use too much credit so they never went on anyway. They were 13 and 14 years old and followed the rules well