Someone is using my iPhone thru certain apps. How do I stop this?

nolneknna55 Said:

"Someone is using my iPhone thru certain apps. How do I stop this?"

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How are you determining this?

Seems all you need to do is modify your credentials, from passwords, to a new Apple ID (open and assign a new eMail address to your current Apple Account).

Modifying your Credentials:

Having so much suspicion, consider modifying your credentials, ASAP, starting with a new password.

• Modify: your login credentials (using both a New eMail and a New Password) for Apple and each and all sites
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID PayPal and for all other accounts that have such an applicable option

No one is using your phone through certain (or any) apps. That is impossible. Why do you think this impossibility is true?