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What is GPRS?
General packet radio service (GPRS) is a packet oriented mobile data service available to users of the second generation (2G) cellular communication systems global system for mobile communications (GSM), as well as in the third generation (3G) systems. In 2G systems, GPRS provides data rates of 56-114kbps.
It is often described as 2.5G—that is, a technology between 2G and 3G. It achieves its moderate-speed data transfer by using unused TDMA channels in the GSM network.

What is baseband?
In signal processing, baseband describes signals and systems whose range of frequencies is measured from zero to a maximum bandwidth or highest signal frequency. It is sometimes used as a noun for a band of frequencies starting at zero.
In telecommunications, it is the frequency range occupied by a message signal prior to modulation.
It can be considered as a synonym to low-pass.
Baseband is also sometimes used as a general term for part of the physical components of a wireless communications product. Typically, it includes the control circuitry (microprocessor), the power supply, and amplifiers.
A baseband processor is an IC that is mainly used in a mobile phone to process communication functions.