Wi-Fi Calling on OPPO A15

[OPPO-Hopeful]

How do I enable Wi-Fi Calling on an OPPO A15? 

(WiFi Calling is activated for my Monthly account.  A15 is on the O2 list of devices supporting it, but unable to find an enable function in the Settings hierarchy.)

[Cleoriff]

@OPPO-Hopeful 

You will find it in My O2.

[MI5 · Accepted solution]

@OPPO-Hopeful 

Settings > Wifi and Internet > Sim and Network then Sim or Sim 2 and the VoLTE and WiFi calling switches are in there.

[OPPO-Hopeful]

That's correct, but doesn't answer the question.  As I said, it's enabled for my account.  The problem is finding how to enable it on the phone.

[OPPO-Hopeful]

Thanks for that (I'm sure I'd looked there before ...)

More info

[MI5]

You're welcome

[jonsie]

Wifi calling also needs to be activated by customer service as well as on the website

[Anonymous]

What is all this excitement about WiFi calling I see so much on the forums?

Don't most plans have unlimited minutes nowadays anyway? Why do people need it? 

Somebody educate me.

[MI5]

No signal.

[Anonymous]

@MI5 Yeah okay thanks for that. I rarely have that problem but if I did I would use VOIP, but I can see it might be usefull to some people though.