BT SmartTalk lets you make calls from your smartphone on your BT landline account - photo 1BT SmartTalk lets you make calls from your smartphone on your BT landline account - photo 2BT SmartTalk lets you make calls from your smartphone on your BT landline account - photo 3BT SmartTalk lets you make calls from your smartphone on your BT landline account - photo 4BT SmartTalk lets you make calls from your smartphone on your BT landline account - photo 5BT SmartTalk lets you make calls from your smartphone on your BT landline account - photo 6