Someone uploaded my iPhones hardware/whole system. Can they get in my phone

After this “friend” performed the process, were you handed back the iPhone with a “Hello” screen as if it were a brand new, out-of-the-box iPhone with all content erased? If so, you may well be safe. If not, you should be concerned.

Getting another phone does not change the fact that the person has all of your private data, so you need to cancel and replace all credit cards, change all passwords for all sites you visit, and take other actions to protect your private data.

KatKattyKat wrote:

Someone uploaded my hardware/whole system of my iPhone.

Perhaps if you explain the complete details of exactly how this was accomplished, we could better answer your question.

KatKattyKat wrote:

and even put in [there] their Apple ID

Then it’s now as if that person owns this iPhone.

Your info is gone. It’s no longer your iPhone. The other person has exclusive access.

Sorry, the scenario you presented does offer an opportunity for the other person to access your data.

Did you set up Find My on your iPhone? If not, your data can be compromised.