> Wouldn't that require the phone to always be on wifi, to avoid hitting the monthly data transfer cap? True, but unlimited data plans do exist and I've found

> Wouldn't that require the phone to always be on wifi, to avoid hitting the monthly data transfer cap? True, but unlimited data plans do exist and I've found that more often than not, one laptop finds another laptop over the internet than using the fallback of using cellular data over the phone to sync. I just installed the F-Droid android client yesterday, it syncs over both Wi-Fi and cellular data by default since until you add devices/folders, it won't spend any mobile data at all, which is when it prompts you to make that choice.