Prepayment to credit meter

Hi Bulb

My friends have moved in next door and are looking to move to you. Are you able to change a prepay gas account to a credit account if they are referred to you? I dont believe the meters are smart, however I was also under the impression smart meters cant be fitted in an apartment building. The meters are located in side the flat. Can you please advise if the gas meter can be made a credit meter to match the electric before they switch?

Thanks

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