According to one embodiment of the present invention, there is provided a method of authorizing a communication device to connect to a network. The method comprises receiving, at a processor, a communication device identifier and a subscriber identifier, determining, by the processor, whether the received communication device identifier is associated with the received subscriber identifier in a data store. Where it is determined that the received identifiers are not so associated the method further comprise requesting, by the processor, a security token associated with the communication device, receiving, at the processor, a security token, determining, by the processor, whether the received security token matches a stored security token associated with the received communication device identifier in the data store, and where it is so determined, authorizing the communication device to connect to the network.