Lumia 630 how is the phone accessing my emails when I am not connected to wifi?

[AC Question]

Lumia 630 how is phone accessing my emails when I am not connected to wifi

Had phone a few weeks on payg credit is going down rapidly, everything is switched off than I can think of, noticed that I can receive and send emails even without wifi access, presume this is the culprit? What do I need to disable?

 

[belodion]

Is Mobile Data switched off?

Also, you may be better off in the Windows Phone forums.
http://m.windowscentral.com/

Poster via the Android Central App