There are several situations that could cause your bill to change, including:
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Change of Plan
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Change of Billing Address
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Monthly Subscriptions to Add-on Services
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New Device Charged to Monthly Billing Amortization
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Corrective Billing Adjustments:
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Roaming Transactions
* Your prorated monthly service fee (MSF) is the partial MSF covering your activation date until your statement date. This may also be charged when you avail of plan renewal, plan change, billing cycle change or reconnection from temporary disconnection.