Toggle Bluetooth.

It's amazing how many problems can be solved simply by turning things off and then back on again.

  1. Swipe up from the bottom edge of the screen to bring up Control Center.
  2. Tap the Bluetooth button to turn BT off.
  3. Tap the Bluetooth button again to turn BT back on.

Alternatively, you can perform the same steps but tap the Airplane Mode button to toggle Bluetooth, Wi-Fi, and cellular all off and then back on again.

Once you're done, try connecting again. If it works, great. If not, keep reading.