The BT Premium Phone has a dedicated block button for one touch blocking and can block up to 1000 numbers. It stores up to 1000 contacts from synced mobiles and lets you auto copy between handsets. It has a 1.8" colour screen, easy guided set up and redial any of the last 30 calls made. Also with outgoing call control, hands free speaker, call transfer and internal calls. (You must subscribe to a Caller Display service from your network provider to block nuisance calls. Charges may apply). Powered by truecall's award winning technology offers users complete control over which calls they want to take and those they wish to block. 100% nuisance call blocking, mobile sync and answer machine means you'll never have to speak to another cold caller again. Telephone information.