How To Remove A Hacker From My Phone App. A factory reset will clear all personal data from the phone and restore it to its original, default settings. Once you’ve rooted out the data breach, you can start protecting your accounts and keeping hackers out of your phone.

Email (work and personal) apple id or google account; But if someone has hacked your google account then that can only be addressed by you using the instructions to regain control and then secure it against hackers. This might prevent a malicious app from using your data and can disrupt its activity if it uses online connection;