Energy firms have admitted that current rates of replacement mean it is likely that thousands of old RTS meters will not have been upgraded in time.

Last line hits the nail on the head

However, beware if someone contacts you claiming you need to pay to change your meter because it is likely to be a scam.

Smart meters are a scam. They are about to all start failing with the 3g switch off too. Why o why are we replacing RTS at all?