Is this a proration, is that why this month's bill is so high?

Changed from an old Mobile Share plan from 2012 that had two lines, to a Mobile Share Plus plan (the 3GB) and added a line to the account. So now we're at three lines for $100/month w/ paperless bill and autopay. We made this page last month in August.

This month's bill is $167. Is this simply a prorated bill, since we went to a more expensive plan and next month's bill will be normal?

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