You are not deciding whether your kids will use screens. They already do, and a flat ban tends to fail the moment it meets a school project...

You are not deciding whether your kids will use screens. They already do, and a flat ban tends to fail the moment it meets a school project, a bored car journey, or a friend's house with different rules. The decision in front of you is narrower and more workable: what rules will actually hold in your house, and what will you do yourself so those rules make sense to a child watching you.
A total ban solves the wrong problem. It treats the screen itself as the danger, when the things you actually want to manage are attention, sleep, what your child sees, and who they can talk to. A ban also has to be enforced forever, by you, against a device your child will eventually own or have unsupervised access to somewhere. Rules that a child understands and that hold up when you are not in the room do more work than a rule that only holds while you are watching.
Aim for household agreements instead of prohibitions. An agreement names where, when, and for what, and it applies to everyone in the house, not just the kids.
Pick a small number of rules and make them specific enough that nobody has to guess what they mean.
Decide which rooms are screen rooms and which are not. A common one worth considering is keeping bedrooms free of screens overnight, with a shared charging spot somewhere in the house that everyone, adults included, uses at night. This is easier to enforce than a rule about hours, because it is about location, not willpower.
Pick the times that matter most to your family and protect them completely rather than trying to police every hour. Meals are the obvious one. If the rule is "no screens at the table," that has to include your phone too, or the rule teaches the opposite of what you intend.
Tie increased independence to demonstrated judgment rather than age alone. A child who tells you when something online upset or confused them has shown you the thing that actually matters, more than a child who has simply gotten older. Loosen rules in response to that, not on a birthday.
Decide the consequence in advance, while everyone is calm, rather than improvising one in the moment. A short, predictable consequence that you actually follow through on beats a severe one you back down from.
Write the rules down somewhere visible if that suits your family. The point is not the document. The point is that everyone, including you, can be held to the same standard without an argument about what was actually agreed.
You do not need to have one big conversation about online safety. You need several small ones, timed to what your child is actually old enough to encounter.
At this age the conversation is about people, not content. Explain that some people online are not who they say they are, and that anyone asking to keep a conversation secret from you is a warning sign, not a normal request. Keep the message simple: if something online makes you feel confused, scared, or uncomfortable, come and tell me, and you will not be in trouble.
Children this age are more likely to be searching for things themselves and messaging people they know from school. Talk about what to do if a message from a friend turns unkind, and about screenshotting or telling you rather than escalating it themselves. This is also the age to explain that anything typed or sent can be seen by people other than the intended recipient, and can be hard to take back.
This is when most kids get more autonomy and often their first personal device. Talk plainly about strangers making contact, about pressure to share images, and about the fact that people misrepresent their age and identity online. Make clear that coming to you with a mistake, including one that feels embarrassing, will not cost them the device. A child who expects punishment will hide the next problem instead of reporting it.
By now the conversation shifts from rules to judgment. Talk about how algorithms and feeds are built to hold attention, not to serve the viewer's interest, so noticing when something is making them feel worse rather than better is a skill worth having. Talk about digital footprint in practical terms: what a future employer, coach, or school might see. Keep checking in about content and contact, not just usage.
At every age, the through-line is the same. You are teaching a child what to do when something goes wrong, not just what not to do.
Children copy behaviour more reliably than they follow instructions, and your phone use is the instruction they are actually watching. If you check your phone at the dinner table while telling them not to, the rule they learn is that the rule does not really apply to people in charge. If you are visibly present, off your phone, and paying attention during the times you have designated screen free, that is the version of the rule that sticks.
This does not require becoming a different kind of parent overnight. It requires the same rule applying to you during the same windows you have set for your kids: the dinner table, the last half hour before bed, the car on short journeys. If a rule only makes sense for children, it will not survive contact with a child old enough to notice the double standard.
Pick one specific time or place, most families choose the dinner table, and agree as a household that it is screen free for everyone, no exceptions for work messages or your own phone. Say it out loud once, at the table, so nobody can claim they did not know. Hold it for a week before you add anything else. A single rule that actually holds beats a full set of rules that quietly does not.