Hacked iPhone 7

I understand what you wrote. In my response everything you describe was you erased your 7 and not the 6. While that was not the intent of what you wanted to do that is a more likely explanation than the phone being hacked.

If you call apple with the IMEI for both devices they may be able to confirm, as well you should have been sent an email for any account activity.

if you log into icloud.com web site > find my phone> all devices> do you see both or just 1?

since the site does not list them as iphone 7 or iphone 6.. just the name of the phone.. "Bob's iPhone" it is remarkably common to erase the wrong one.

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If you are certain this is not your issue, i would back the phone up to iTunes and restore it to factory setting (and update) to remove anything you dont want.

If your iOS device is not jailbroken there is no way to hack it. The tools available for developers from Apple to write software for iOS devices do not contain routines that could be used to override securities on the device, and software to use on the device is only available from the App store which is maintained by Apple.

Enabling find my phone is not making your phone susceptible to data breaches.

If I had to guess you download the update, postponed it and the device updated at the end of that postponement.

If you have any concerns otherwise regarding your devices security at this time you can reset your device to the factory defaults.

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

This is a volunteer forum.

you can not enable find my phone on a lost phone.. you erased your current phone.

This is not an indication of hacking. My iPad 2 did exactly the same thing while I was using it. It first crashed out of my web browser, and when it restarted on its own, it reverted to the first time start up screen. I enetered my intital activation ID and it has been fine since then.

Sorry, I'm not going to get involved in your conspiracy theories. As to the issue with your previously repaired iPhone, there was an issue with the proximity sensor ...... that's it. No conspiracy. You should have taken it back to the place that repaired it and demanded they either fix it properly or refund your money.