I'm the unpopular parent who limits their 14 yo's phone, luckily dd has a couple of friends with similar minded parents so they bonded about how strict/lame we are.
We use google family link and she is restricted to 3 hrs on weekdays, 4 on weekends, phone locks 8pm-7am weekdays, 9pm-7am weekends. This is plenty imo.
Some phone features are available all the time, spotify, messenger, calls.
Same as OP she would literally go on it all day and night long if we didn't put restrictions.
I also limit certain apps like you tube to 2 hrs, snap chat 1 hr etc. No tic toc.
I always try and be a bit flexible if she asks for additional time or she wants to message her friends later on.
She has a close group of friends but they don't tend to socialize much outside of school unfortunately and she has a sport she does on the weekends. So way too much free time to spend on devices every evening.
I plan to phase out the restrictions over the next couple of years, but the bedtime one will stay in some form for a few years.