Is it possible to get banned from Pokémon GO if someone else uses your phone to play on it while logged into your account and using an IV checker or other map hack?

Account Security and Risks

1. Unauthorized Access: If someone else uses your phone while you're logged into your Pokémon GO account, it is generally acceptable as long as you control the device. However, if they log in from a device you do not control, it becomes a violation of the Terms of Service (TOS)
2. Use of Third-Party Tools: Engaging with third-party applications that manipulate gameplay, such as IV checkers or map hacks, can lead to account bans. Niantic actively monitors for cheating and unauthorized access, and using such tools can result in penalties ranging from temporary suspensions to permanent bans
3. Multiple Logins: Logging into your account on multiple devices simultaneously can trigger bans, especially if it appears as if you are engaging in suspicious activity (e.g., rapid location changes)
4. Bans for Cheating: If the person using your phone employs cheats or hacks, even without your knowledge, your account could still be at risk. Niantic has the right to ban accounts associated with cheating behaviors, regardless of who was actively playing at the time

Conclusion