As this is a deal being offered by Carphone Warehouse you would really need to check out the T&C's with them @GrayOfficial as you would be their customer.
The 1st bill maybe more due to a Pro Rata System which is how billing and allowances catches up.
When Carphone Warehouse pass on the new contract information to Vodafone then Vodafone can start setting up payment collections and the Network Connection.
A.contract taken out directly with Vodafone Uk usually follows this path 》When-will-I-get-my-first-bill-and-how-much-will-it-be.
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Current Phone >
Samsung Galaxy s²³ Ultra 512gb Phantom Black.
