Page "General Packet Radio Service" Paragraph 1

GPRS usage is typically charged based on volume of data transferred, contrasting with circuit switched data, which is usually billed per minute of connection time.

GPRS data may be sold either as part of a bundle ( e. g., up to 5 GB per month for a fixed fee ) or on a pay-as-you-use basis.

Usage above the bundle cap is either charged per megabyte or disallowed.