How do I remove unauthorized access to my iPhone from another device?

Sign out of your Apple Account by going to Settings > [name on top] > Sign Out, then sign back in.

Kalibunns1 wrote:

How can I find out for sure if someone is logged onto my phone without permission

It is simple. Go to Settings > [name on top], and scroll to the bottom to see devices logged into your account. For any unknown devices, you can remove them and you will then need to change your Password. A password would be required to log into your account so that is something you would have had to give the person, although it may have been done accidentally.

Yentihwsknips wrote:

So you think BOB. I have had the same problem for quite some time!

Yes, if the device is not located at Settings > [name on top], then they are not logged into your account.

Someone is logged into my iPhone. It doesn’t show up under other devices signed in.

There is no way that someone is logged into your account if the other device does not show up in list of devices using the same Apple ID.

End of that discussion.

I think someone is getting info from my phone I think there logged on my device

How can I find out for sure if someone is logged onto my phone without permission

So you think BOB. I have had the same problem for quite some time!