Wi-Fi Calling

[Wizz]

Hello guys,

Do any of you have any idea why on PAYG you are not allowed to use wi-fi calling? 

I live in an area where I have poor reception and the only fix they have is for me to have a contract.
I work in an area where they have poor reception and the only fix they have is for me to have a contract.
I was almost made to feel bad for choosing PAYG and quickly pointed towards having a contract.

So, again, any of you guys have any idea why on PAYG you are not allowed to use wi-fi calling? 
It is more of a curiosity as I will soon migrate to competition who guess what, they have wi-fi calling for PAYG. 

Cheers

[MI5 · Accepted solution]

@Wizz 

Purely just a business decision by O2.

You can get a monthly SIM only plan for the same price as PAYG so it persuades people to switch.

[Wizz]

Thanks for your honesty, is a rare thing these days! Cheers

[MI5]

You're welcome