Hello Thu Ha,
I can confirm that since you asked for your phone number to be transferred, Bouygues will stop your previous contract with them. The transfer happened today.
If Bouygues edited a bill before today, they will create a last bill during the next 30 days.
Since you always pay your plan in advance, if you didn't have an engagement with Bouygues, the last bill will include a reimbursement for the days where you phone line was already transferred.
Don't hesitate to write again to us if you have any other question.
Have a nice day.
Maude, Conseillère Assistance Mobile
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