1. A method of operating a network system, the method comprising: receiving a first request from any first device in a plurality of similar wireless end-user devices, the first request for a secure device credential, performing a verification step of one or more device identifiers supplied by the first device, and, upon a successful verification in the verification step, generating a secure device credential for the first device, associating the secure device credential with one or more device identifiers of the first device, and securely sending the secure device credential to the wireless end-user device; based at least in part on the secure device credential, negotiating a secure message link between a message link server in the network system and a device link agent in the first device; receiving, over the secure message link, a second request from the first device, the second request for a secured application credential, for any first application identified from a plurality of device applications registered to use wireless network communications, the second request comprising a general application credential for the first application; and in response to the second request, generating, based on the identified first application and the secure device credential, a first secured application credential unique to the first device, and sending the first secured application credential to the first device over the secure message link.