USB GPRS modems use a terminal-like interface USB 2.0 and later, data formats V.42bis, and RFC 1144 and external antennas. Modems can be add in cards (for laptop) or external USB devices which are similar in shape and size to a computer mouse.

GPRS can be used as the bearer of SMS. If SMS over GPRS is used, an SMS transmission speed of about 30 SMS messages per minute may be achieved. This is much faster than using the ordinary SMS over GSM, whose SMS transmission speed is about 6 to 10 SMS messages per minute

The GPRS context 1 is set with +CGDCONT Hayes command ^[1].

Please help improve this section by expanding it. Further information might be found on the talk page or at requests for expansion.

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Availability

In many areas, such as France, telephone operators have priced GPRS relatively cheaply (compared to older GSM data transfer, CSD and HSCSD). Some mobile phone operators offer flat rate access to the Internet, while others charge based on data transferred, usually rounded up to 100 kilobytes.

During the heyday of GPRS in the developed countries, around 2005, typical prices varied from EUR €0,24 per megabyte to over €20 per megabyte. In developing countries, prices vary widely, and change. Some operators gave free access while they decided pricing, for example in Togocel.tg in Togo, West Africa, others were over-priced, such as Tigo of Ghana at one US dollar per megabyte or Indonesia at $3 per megabyte. Mero Mobile of Nepal charges users up to a set amount and then has unlimited Internet access. AirTel of India charges $0.025 per megabyte. As of 2008, data access in Canada is still prohibitively expensive. For example, Fido charges $0.05 per kilobyte, or roughly $50 per megabyte.^[2]. In Venezuela, Digitel charges about $20 per 100 Mb or $25 for unlimited access.

Pre-Paid SIM Cards allow travelers to buy short term internet access. The mean price in developing nations is US$1 per hour^{[citation needed]}.

The maximum speed of a GPRS connection offered in 2003 was similar to a modem connection in an analog wire telephone network, about 32 to 40 kbit/s, depending on the phone used. Latency is very high; a round-trip ping is typically about 600 to 700 ms and often reaches 1s. GPRS is typically prioritized lower than speech, and thus the quality of connection varies greatly.

In order to set up a GPRS connection for a wireless modem, a user must specify an access point name (APN), optionally a user name and password, and very rarely an IP address, all provided by the network operator.

Devices with latency/RTT improvements (via e.g. the extended UL TBF mode feature) are generally available. Also, network upgrades of features are available with certain operators. With these enhancements the active round-trip time can be reduced, resulting in significant increase in application-level throughput speeds.

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See also

• APRS
• CDMA
• EDGE
• UMTS
• GPRS Core Network
• SNDCP
• IP Multimedia Subsystem
• HSDPA
• Multiplayer Mobile games
• List of device bandwidths

The right convention for Access Point is AP

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References

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External links

• Introduction of high-speed data in GSM/GPRS networks
• GPRS Security Information
• Free GPRS Resources
• Free online tutorial.
• GSM World, the trade association for GSM and GPRS network operators.
• Palowireless GPRS Resource Center
• GPRS Attach and PDP Context Activation Sequence Diagram
• GPRS Tutorial How machines use the GPRS network
• GPRS to Wi-Fi How-to The Yellow Subterfuge GPRS Blog

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