I have 2 kids with I-phones, 10 and 13. I use the screen time settings to limit them to 2hrs daily for entertainment/video games during the school week, although they can call/text friends. They have PCs for school work with Norton Parental Control to filter out questionable websites, but by the time they're done with homework and their extracurriculars, there's not much time left over for electronics. On weekends, I let them blow off steam on their electronics for a few hours. All devices stay downstairs where I can keep an eye on them.
I recently bought a timed locked box for the kitchen counter for them to put their phones in every night at bedtime around 9pm, and they can't take it out until morning. It ends the sneaking the devices up to the rooms, and no more fighting about it. They're not allowed to bring their phones to school.
Honestly, I wish I had waited until they were older before getting them any phone. Or went with an old-school flip phone first. It's constant monitoring, and they don't understand their brains are still developing which is the reason for the limits. So yes, the limits are tough to continually enforce. For summers, I have to come up with a different plan, like making them read 30 min a day prior to electronics, or enrolling them in sports camp or tennis lessons to avoid use of electronics.
