Cellular technologies extend the bounds of existing telecommunications infrastructure by connecting mobile units to the public network operated by the local exchange or long distance carriers.

The rapid development of the global mobile wireless market has stimulated a demand for new terminals, networks and services. A critical factor here is the interoperability. Through an active partnership between network operators and terminal manufacturers, there are certification programmes (GCF, PTCRB) to ensure global interoperability of 2G and 3G mobile wireless terminals at both bearer and application enabler level. AT4 wireless is member of these certification programmes and provides test solutions to achieve successful certifications and engineering tests.