I changed my phone number half-way through the month and my bill now has partial charges for that time period. Did changing my number change my plan? What are these charges for?
Your plan will remain the same, but you will be charged for part of it under the old number and the rest under the new number. The portion charged to each number will be prorated based on exactly when in the billing cycle you changed your plan. Your minutes will be prorated accordingly as well.