Um. Ipleak is not really a reliable way to determine, well, anything. What is the question?
I, for my part, only use static ipv4, and tunnel ipv6 on a dedicated link. So, my ipv4 (from the telecom), I use to connect to a proxy server (that I control), which, in turn, has multiple vpn providers connected to give my ip ‘from coast to coast’. Sadly, I no longer have a server parked at mae west.
In any case, my phone, when connected using 4g, will never be anonymous. Except when using wlan at home. Using a vpn feature on a telephone that is NOT using wifi, is not anonymous.
vpn on a phone is silly.