RPM 3G message on 4G connection

[JoeV]

My RPM tablet shows a 4G connection but when I place a call the following message is displayed (call does connect):

"((3G)) Calling over 3G network may cost a lot of traffic."   What does this mean?

[Marcux]

I'll look into that, but it just lets you know that if you don't have an unlimited data plan, it will use your bandwidth and might cost you money.  This does not show on wifi, because it's not part of your data allotment from your 3g provider.

[Deano]

So is there a way of turning this warning off.

Cheers