Sons dad bought our 11 year old son a smartphone last year. Originally his dad set up some parental controls, but ended up removing them after son snuck onto phone at 2am and text his dad to remove them.
Now we limit his screen time here, but when he is round his dads every other weekend, he is on his phone literally all night, watching YouTube videos, playing games, or browsing Google PlayStore.
From looking at his phone history it appears he is sometimes only getting 1-2 hours sleep each night when round there.
He has just started secondary school and do not want this to start affecting his health. His dad clearly has no issue with this and it seems he is aware how much time he spends on it. Have also spoken to my son multiple times about it and the implications but he often gets emotional about it and sees no issue with it either.
What should I do? P.s I cant override the parent controls as I didn't set them up originally.
Edit: I taketh phone off him at night when he stays with me. But at his dads he let's him do whatever.