How do I stop a sim swapping hack

If you are indeed the victim of an unauthorized SIM-swap, only your carrier can assist.

Eltrapcollection Said:

"How do I stop a sim swapping hack: My phone has been hacked by some open source hackrf one or flipper device. Or a sim swapping. How do I stop them from hacking and making changes in my phone?"

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Troubleshooting a Hacked iPhone:

An iPhone cannot be hacked, unless it has been jailbroken, and the only way that can be know if it has been is if you are aware of it. So, what changes have you seen occurring on your iPhone?

Is this Under YOUR Apple ID?

If this is under your Apple ID, then it is under your account. If not, then have the person currently-signed perform as instructed here, including the iCloud logout: What to do Before you Sell, Give Away, or Trade In your iPhone or iPad - Apple Support. The person should have known better.

Set this iPhone Up Anew:

If you want to get things safely blocked out, then reset the iPhone to factory settings, as if you were to sell it. Perform as instructed here, including the iCloudlogout: What to do Before you Sell, Give Away, or Trade in your iPhone, iPad, or iPod touch - Apple Support. Set it up you child's device, and then enable Screen Time.