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Radio Frequency Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current which is fed to an antenna.
Research In Motion Research In Motion Limited (RIM) (TSX: RIM, NASDAQ: RIMM) is a Canadian wireless device company. It is best known as the developer of the BlackBerry handheld communication device. RIM is headquartered in Waterloo, Ontario, and is a sponsor of RIM Park in the northeast of the city. It was founded by Mike Lazaridis, who currently serves as its co-CEO along with Jim Balsillie. RIM develops its own software for its devices, using C++ and Java technology. RIM also develops and sells embedded wireless data components.
RIM Research In Motion Limited (RIM) (TSX: RIM, NASDAQ: RIMM) is a Canadian wireless device company. It is best known as the developer of the BlackBerry handheld communication device.
Roaming oaming is a general term in wireless telecommunications that refers to the extending of connectivity service in a location that is different from the home location where the service was registered. The term "roaming" originates from the GSM (Global System for Mobile Communications Association) sphere. Traditional GSM Roaming is defined (cf. GSM Association Permanent Reference Document AA.39) as the ability for a cellular customer to automatically make and receive voice calls, send and receive data, or access other services, including home data services, when travelling outside the geographical coverage area of the home network, by means of using a visited network. This can be done by using a communication terminal or else just by using the subscriber identity in the visited network. Roaming is technically supported by mobility management, authentication, authorization und billing procedures.

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