Yes, and you’re likely to get a much better deal if you do. And with the smart meter rollout in the UK well and truly underway, you could also benefit from switching to one of these. A smart meter measures your energy usage in real time and sends this information back to your supplier, which results in far more accurate bills.
However, often people have prepayment meters installed due to arrears from previous energy tariffs, or issues with credit ratings. If this is the case then you may have difficulty switching to a standard meter unless you have cleared your arrears and improved your credit rating.