Editing GPRS (section)

=== Hardware ===
Devices supporting GPRS are grouped into three classes:
;Class A: Can be connected to GPRS service and GSM service (voice, SMS) simultaneously. Such devices are now available{{as of?|date=June 2018}}.
;Class B: Can be connected to GPRS service and GSM service (voice, SMS), but using only one at a time. During GSM service (voice call or SMS), GPRS service is suspended and resumed automatically after the GSM service (voice call or SMS) has concluded. Most GPRS mobile devices are Class B.
;Class C: Are connected to either GPRS service or GSM service (voice, SMS) and must be switched manually between one service and the other.

Because a Class A device must service GPRS and GSM networks together, it effectively needs two radios. To avoid this hardware requirement, a GPRS mobile device may implement the [[Dual Transfer Mode|dual transfer mode (DTM)]] feature. A DTM-capable mobile can handle both GSM packets and GPRS packets with network coordination to ensure both types are not transmitted at the same time. Such devices are considered pseudo-Class A, sometimes referred to as "simple class A". Some networks have supported DTM since 2007{{citation needed|date=June 2018}}.

[[Image:Huawei E220 (Three).jpg|right|thumb|[[Huawei E220]] 3G/GPRS Modem]]
[[File:Wireless GPRS Modem.jpg|thumb|A [[PC Card]] GPRS modem for use with a notebook computer]]
USB 3G/GPRS modems have a [[terminal software|terminal]]-like interface over [[USB]] with [[V.42bis]], and {{IETF RFC|1144}} data formats. Some models include an external [[antenna (radio)|antenna]] connector. Modem cards for laptop PCs, or external USB modems are available, similar in shape and size to a [[computer mouse]], or a [[pendrive]].