These steps are generally intended for reusing Yealink phones with Broadtela service. You can reuse existing Yealink phones with Broadtela service as long as they are a supported model
Factory Reset your Yealink phone
Power on the phone.
Wait until the “Idle” screen is visible.
Hold down the “OK” button until the message “Reset to factory settings?” appears.
Press “OK” or “Yes” depending on the model.
Your phone has been successfully reset.
The device web interface (GUI) allows you make changes to the phone’s settings via a web browser on your computer, which can often be more convenient than on the phone screen itself. You must ensure that: