A method comprising: determining, at an element or function in a wireless communication network, one or more first privacy features supported by the wireless communication network; sending, from the element or function, to a user equipment of the wireless communication network, a message comprising an indication of the one or more first privacy features supported by the wireless communication network; receiving, at the element or function, from the user equipment, a registration request comprising a subscription identifier for a subscriber of the wireless communication network associated with the user equipment, the registration request further comprising one or more second privacy indicators; and determining one or more second privacy features of the user equipment for processing the registration request based on the one or more second privacy indicators in the registration request; wherein the message comprises a System Information Message comprising a Master Information Block or a System Information Block, the System Information Message further comprising one or more first privacy indicators selected based on the determined one or more first privacy features, the one or more first privacy indicators comprising an indication of whether the wireless communication network is configured to handle the privacy-protected subscription identifiers in registration requests, the one or more first privacy features supported by the wireless communication network comprise an ability of the element or function to handle privacy-protected subscription identifiers, and the one or more second privacy indicators comprise a field indicating whether the subscription identifier in the registration request is privacy-protected. determining, at an element or function in a wireless communication network, one or more first privacy features supported by the wireless communication network; sending, from the element or function, to a user equipment of the wireless communication network, a message comprising an indication of the one or more first privacy features supported by the wireless communication network; receiving, at the element or function, from the user equipment, a registration request comprising a subscription identifier for a subscriber of the wireless communication network associated with the user equipment, the registration request further comprising one or more second privacy indicators; and determining one or more second privacy features of the user equipment for processing the registration request based on the one or more second privacy indicators in the registration request; wherein the message comprises a System Information Message comprising a Master Information Block or a System Information Block, the System Information Message further comprising one or more first privacy indicators selected based on the determined one or more first privacy features, the one or more first privacy indicators comprising an indication of whether the wireless communication network is configured to handle the privacy-protected subscription identifiers in registration requests, the one or more first privacy features supported by the wireless communication network comprise an ability of the element or function to handle privacy-protected subscription identifiers, and the one or more second privacy indicators comprise a field indicating whether the subscription identifier in the registration request is privacy-protected.