I've just switched to SP, but already have Smart Meters that were installed when I was a customer of BG. Although I never managed to use tham to save fuel (warmth, light and hot food are in my view a necessity!) they were good in that I could keep track of how I was doing against my DD! How soon do SP realise I have them, or do I have to contact them in some way!
SP cannot read your EE smart meter, you must send in readings, press 9 on the meters to see the figures. You will get a big bill because it is 7 months since EE closed and you have not paid to SP.