I use FastMail for email, contacts and calendar with DavDroid https://play.google.com/store/apps/details?id=at.bitfire.davdroid&hl=en https://play.google.com/s

I use FastMail for email, contacts and calendar with DavDroid https://play.google.com/store/apps/details?id=at.bitfire.davdroid&hl=en https://play.google.com/store/apps/details?id=at.bitfire.dav...