Yes, it is possible to transfer your existing phone number to BT when you switch to their services. This process is known as number porting. To begin the transfer, you will need to obtain a Porting Authorisation Code (PAC) from your current provider. This code is essential for initiating the transfer. Once you have the PAC, you can provide it to BT during the sign-up process or afterward as per their requirements.
It is important to ensure that your current service is active until the transfer is complete, as this will facilitate a smoother transition. Generally, the process may take a few days, and BT aims to keep your existing phone number active during the changeover. For detailed steps and any specific requirements, it is advisable to visit BT's official website for the most current information and guidance related to number transfers.