Smart functionality that sends readings automatically and shows real time energy usage means your bill will always be reflecting what you’ve used. You can also see what gadgets and appliances cost you the most money. Although this means you can always be on top of your spending, some people don’t like to know this and prefer estimated bills. They prefer to see only see their actual spending once or twice a year when the supplier sends out a bill after a meter reader comes around.
Current smart meters can be supplier specific: So, if you decided to switch suppliers in the future, you may lose the smart functionality (sending automatic readings) if your existing smart meter isn't compatible with your new supplier's technology. This means your meter will act like a normal meter and you’ll have to get a new smart meter installed to continue to get automatic meter readings sent to your new supplier. At the moment, suppliers will install one for you at no cost to you. As technology progresses, this should solve this problem in the future thanks to greater compatibility.