Re: Adobe was doing the same thing
Any ebook using ePub using Adobe DRM.
Amazon also does the same unless you turn it off. Amazon eReader App on Android tries to call home ANYWAY, even if you are not using the reader, so I removed it.
Kobo does it on non-DRM ePub unless you turn it off.
This is one reason I remove DRM. I don't share copies.
I only use my "smart phone" as a feature phone, Data isn't enabled on my mobile package and I've only turned on WiFi a couple of times to try apps that allegedly work without Internet. Same with my tablet.