JuliusSeizureX wrote:
I was sharing Apple ID with an ex for FindMyiPhone, but I don't have findmyiphone or anything on anymore... Does this personal hotspot mean they're logged in to my apple ID?
You shouldn't be sharing an Apple ID with anyone. It's not required that you do so for FindMyIPhone. You can check what devices are signed into your Apple ID using the instructions at the link I provided above. If your ex is using your Apple ID, you can remove the device from your Apple ID.
Change your Apple ID password.
Change your Apple ID password - Apple Support
If you are still on good terms with your ex, you should let them know that they need to set up their own Apple ID and give them the opportunity to sign out of your Apple ID on their phone before you make the change.
How to “unshare” an Apple ID - Apple Community
ETA: we both posted at the same time. Try going to Settings>General>Transfer or Reset>Reset Network Settings and reseting them. Them only thing you'll lose is saved WiFi passwords.