O2 firmware sony xa2

[DannySimstar]

How do i get o2 firmware installed on my Xperia Xa2 ultra? So I can use WiFi calling? Cos the signal is terrible, drops to no service all the time. But apparently its excellent indoors and out! So must be me and about 8 different phones that are not good enough

[MI5]

@DannySimstar 

No special firmware required but you do need to call O2 to get it enabled on your account.

https://www.o2.co.uk/connectivity/wifi-and-4g-calling

Guide: Coronavirus Community Help and Support 

The best number to call on appears to be 0800 587 4005