Nastav si v mobilu ať u konkrétní sítě použije svoji skutečnou MAC.
https://source.android.com/docs/core/connect/wifi-mac-randomization-behavior
Ale možná řešíš neexistující problém.
Persistent randomization
Android uses the persistent randomization type by default when the MAC randomization feature is enabled. Android generates a persistent randomized MAC address based on the parameters of the network profile including SSID, security type, or FQDN (for Passpoint networks). This MAC address remains the same until factory reset. The MAC address does not get re-randomized if the user forgets and re-adds the Wi-Fi network since the MAC addressed depends on the parameters of the network profile.
Persistent MAC addresses are necessary in cases where networks rely on the persistence of the MAC address to provide useful functionality to the user, for example, to remember a device and allow users to bypass the login screen as expected, or to enable parental controls.
For Android 10 and 11, the framework uses persistent randomization for all networks when MAC randomization is enabled.