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Thank you for reaching out to us. After changing your billing cycle date, you receive 2 bills within a 30 days period: 1 with prorated Monthly Recurring Charges and 1 with a full month in advance MRC (proration may apply if Price Plan/Svc changes made to account during bill period).
In regards to your upgrade, we would like to take a look at your account and check your options.
Sprint Social Care