@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
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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