Transfer ISP nowadays is like MNP. You go and register with Maxis, let them know you are transferring from Unifi. After register, they will give you the transfer ID. Bring the transfer ID to TMpoint and tell them you want to port out. All process should take about 2 weeks to complete.
You terminate or switch ISP? If terminate no transfer ID. If want to change ISP to Unifi for example, then you need to register at Unifi and submit the transfer ID to Digi.