A network access system, e.g. a network hotspot, requires a mobile network access device, e.g. a smart phone or WiFi only device, to provide a network access standard designation and/or a device identification datum to gain access to network services. The network access standard designation may be provided by the mobile network access device to an online signup server via a EKU_key_purpose field of a PKCS10 certificate signing request. The device identification datum may be provided to the OSU via a subject field of the signing request. The OSU may require that the device identification datum be the same as a device identification datum provided by the mobile network access device prior to the mobile network access device requesting a signed network access certificate.