Hello @Sonu3 ,
Welcome to the community,
It will be from the date you start your contract plus one month in advance, as you always pay your contract one month in advance, then it will be every month for one month, if you get what I mean.
Flex pay, if you buy an item, you spread the payment over a period of 2-3 years, but with the option of paying it off sooner if you so wish, so no need to change your contract to a sim only contract, and once the flex pay is paid, then you will only be paying for your sim only contract, and once the minimum term is up, that will just continue on a monthly contract basis.
Hope this answers your question.
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