The Ericsson R190 is capable of operating in both satellite and GSM 900 modes. Once out of cellular range, the phone automatically switches to satellite mode to send or receive calls making it the ideal phone for users travelling to remote areas beyond cellular coverage.

With the dual mode Ericsson R190, subscribers in the Asia-Pacific region can benefit from extended mobile connectivity as a result of the complementary nature of satellite and GSM systems.

The phone is targeted at users who require extended connectivity to be able to call wherever they are in the Asia-Pacific region. ACeS subscribers travelling outside satellite coverage will be able to roam GSM networks worldwide.

The Ericsson R190's small size is enabled by GMSS, which is derived from the popular GSM standard and exploits the filters, mixers and RF base band components already present in a GSM handset. Subscribers are able to roam on GSM networks and remain in communication should they move out of coverage area by switching to satellite mode.

The Ericsson R190 functions in four modes: GSM preferred - searches first for a GSM network and switches to satellite if one isn't found, GSM only - searches only for a GSM network, satellite preferred - searches first for the satellite network and switches to GSM if it is not found, and satellite only - searches only for the satellite network. The phone is complemented by a range of useful accessories that will simplify and help usage in different situations..