A common issue with the Mitel phones is the Handsets will stop pairing / charging.
Charging issues are either the connectors need cleaned on the phone and handset, or the battery is bad. If you need a new battery, you can find them on Amazon pretty cheap. Search for Mitel Handset Battery and verify you are buying the correct one for your make / model phone. 1 screw on the handset itself is removed to find the battery compartment.
Pairing is also a common issue. Mitel and Prime both haven't been much help in this regard. It seems to usually be an issue with the Bluetooth module in the base unit. Things to try:
- Factory Reset phone - On phone, press Gear icon, Advanced, 73738, Restore Default.
- Unpair and repair handset - On phone, press Gear icon, Advanced, 73738, Bluetooth, remove entry for handset and pair handset.
- Reset handset - On handset, press vol UP, then vol DOWN, then hold the green / red button until it turns off.
- Charging - If you replaced a battery or handset, it can take upwards of a few hours of charging to see it in the Bluetooth menu.