Welcome to the TTNC help centre and developer hub. You'll find comprehensive guides and documentation to help you start working with TTNC as quickly as possible, as well as support if you get stuck. Let's jump right in!
Calls made to 0800 numbers from BT payphones incur an 85p per minute surcharge. This is in addition to your standard call forwarding costs. To avoid this surcharge, you can block calls made from BT payphones using the steps below.