Please follow the below steps to resolve the issue on your iOS device:
1. Open the "Settings" on the iPhone.
2. Tap on "Bluetooth."
3. Find the earphones you want to forget in the list of devices.
4. Tap the "i" icon next to the earphones.
5. Tap "Forget This Device."
6. Confirm the action by tapping "Forget Device" in the pop-up.
7. Open the Nothing X App to pair the earphones again.