Nuisance Call Blocking Only talk to the people you want to by blocking up to 20 numbers. For peace and quiet, switch on Do Not Disturb so that your phone won t ring or light up. Easy to Use Our BT phones have excellent sound quality with volume adjustment to suit your needs. See who\'s calling before answering on the 1. 5\" amber display. Freedom to move in your house Save up to 50 contacts. All these contacts are automatically copied to all of your handsets Adjust the volume if the caller is too loud or too quiet You must subscribe to a Caller Display service from your network provider for the block nuisance calls feature to work. Charges may apply.