A. 1. Ensure that Bluetooth is enabled on your iPhone by going to Settings > Bluetooth.
2. Restart both your iPhone and the printer to reset the Bluetooth connection.
3. Forget the printer in your Bluetooth settings and then re-pair it. Go to Settings > Bluetooth, tap on the printer, and select 'Forget This Device'. Then, reconnect.
B. 4. Make sure the printer is within range and that there are no obstructions that could interfere with the Bluetooth signal.