How can I limit who my child can text on iphone?

Okay so reading everyone’s replies, I think we can actually put together a clean combined approach here for the original poster

Let me pull the best parts of what people said into one flow.

The Combined Setup (Step by Step)

Phase 1: Lock Down the Device

  1. Enable Screen Time with a unique passcode (Auralyte covered this well above)
  2. Set Communication Limits to Contacts Only for both active and downtime periods (Fluxorix’s point about setting BOTH is important)
  3. Remove or time limit any third party messaging apps (Silicrypte nailed this)

Phase 2: Build the Safe Contact List

  1. Start fresh with only approved contacts (TriviaNext’s method)
  2. Enable Ask to Add Contacts
  3. Include emergency adults like family and school staff

Phase 3: Stay Informed Without Overreacting

  1. Do a weekly 3 minute check of recent contacts (PulseNext’s checklist works great here)
  2. Add a monitoring layer if needed (CloudKernel11 and Tekvanta both mentioned good options)
  3. Keep the conversation going with your daughter so she knows the door is open

The Key Thing

No single setting does everything. It is a combination of device settings, contact management, and ongoing communication that actually works long term. One without the others leaves gaps.