Illicit costs for Whatsapp messages

[Anonymous]

I am very careful when travelling out of Europe, with Roaming off so I communicate with my family by using local WIFI based Whatsapp messages which should be at no cost to me so why does O2 charge me?

[MI5]

There is no charge for using WhatsApp over WiFi.
You should have mobile data off completely, not just roaming or else there is a chance that data could be used.
What are the charges you are getting?

[viridis]

If data isn't manually turned off, WhatsApp as well as numerous other apps, still connect in the background.

[Marjo]

Hey @Anonymous, how are you doing? Did you manage to find out why you got charged - would the above suggestions explain it?

[Anonymous]

Hi various responders, it does explain certain charges; but I had the same problem in Spain last year even with Roaming and Data off, only using the home based wifi-I queried it with O2 then and didn’t get what I considered a fair answer. With all R and D off now and only use of wifi for Whatsapp it’s still hitting my account on average £1.60 a day....two weeks behind. I can’t be bothered anymore-will probably change to EE after nearly 25 years with Bt/O2.

[MI5]

What does your MyO2 actually say the charges are for?