At the moment, smart meters aren't always compatible with different providers, which means if you switch to another supplier, your smart meter could lose some of its ‘smart’ functionality. However, all this means is that you'd have to go back to manually providing meter readings to your new supplier. Other ‘smart’ functions, such as in-home display of energy use, should still work.
The Government is planning to make all smart meters compatible between different providers by 2020, but currently this isn’t possible.
For more information on this you might find it useful to take a look at our blog post.