Glo Syncing epubs

Hello there,

I had a question, I don 't have the Kobo Glo yet (it will arrive in a few weeks) but I was wondering if Kobo syncs all the ebooks on the ereader?
Not just only the one I buyed in the kobo store but also epubs?
And when I open them, for example, on my smartphone running android do I need a permanent wifi connection?

Sorry for my bad english, I'm from the Netherlands.

Thanks