[bluephoenix20]

I have a Samsung Galaxy S6. Everytime I use FB messenger video call, I get a warning that says:
"Calls are free over Wi-Fi. Standard charges may apply for calls over a mobile network."
and there are 3 options:
1) Use Data
2) Use Data and don't warn me next time
3) Cancel

Even when I am connected to Wi-Fi, the same message still displays. When I hit Cancel, my call gets dropped. I can only use the feature if I click Use Data.
This has never happened before and I wonder if I accidentally changed some settings (unknowingly) or it's just problems with my service provider. Some tips and advice will be much appreciated. Thank you.

[PapaGary]

That is normal. Video requires data.

[Pows Powsee]

Try this go to settings: apps: messenger app clear cache, clear data and force stop then open the messenger app again
then skip everthing then thats it.

[AbelAblang]

it was helpful bro, thank you! xD

[chiefcrazypants]

I cleared the data and cache, and it did work, but only temporarily. Does this mean I have to keep on doing that every few days? or is there a more permanent solution? I can't even receive calls without having to "okay" that stupid warning. Thank you

[Nathan Timms]

I tried it and it works, I had standard charges data on Facebook messenger for a short while but I followed the instructions you put up and I can't believe that it actually works, thanks so much for your help man, now I got free WiFi calls on Facebook messenger, thanks man.