Abstract: A cellular telephone (102) in a vehicle includes a data carrier system comprising a first semi-permanent Subscriber Identity Module (SIM) (200) selectively couplable to the cellular telephone (102) and a second SIM (300) selectively couplable to the cellular telephone (102) in preference to the first SIM (200), the first SIM (200) being arranged to be decoupled from the cellular telephone (102) when the second SIM (300) is coupled to the cellular telephone (102). During a predetermined period of time, the cellular telephone (102) is arranged to be ensured of a supply of power and the second SIM (300) is arranged to be decoupled from the cellular telephone (102), thereby causing the first SIM (200) to be coupled to the cellular telephone (102) for the execution of a task requiring the first SIM (200).

Abstract: A communications system having a base station and a handset, capable of communicating over a base set of communication channels. Selecting one of the base channels for establishing communication. The handset sending a message, informing the base station, if it is capable of communicating over any extended set of communication channels, beyond the base set of channels, and if so, where the extended set of channels are located. The base station sends a message to the handset, informing the handset whether the base station has extended channel capability. If the base station has extended channel capability, the handset tunes its front end filters to match the indicated spectrum from the base station.