Wifi Calling

[rpiMike]

Why is wifi calling not available on Pay as You Go? The O2 mobile network is currently down in our area.

[pgn]

Good question, and O2 is not the only network to impose that restriction, @rpiMike 

https://www.o2.co.uk/help/network-coverage-and-international/wifi-and-4g-calling - down in the FAQ section:

I guess you could move to the cheapest SIM-Only contract and get it, handset permitting, for not much more than the 10/month cheapest PAYG?

[madasaf1sh]

Probably because the ARPU on PAYG is so low, that there is no return on investment. 

[rpiMike]

What’s ARPU?

[MI5]

@rpiMike 

Average revenue per unit.

In English, it means O2 don't make enough off PAYG.