It's not a "guess". The last Android release that lacked support for block-device-level encryption was KitKat, which shipped in 2013. Any device being advertised with the "Android" trademark (to be fair: AOSP-based clone OSes like Amazon's have been slower to evolve) over the last two years has that support.
Please don't hijack an important security discussion to engage in meaningless platform flamage. Users with Android phones have this available and they should enable it, not be told that they need to "guess".
Also the parent post was talking about usage, not availability of encryption. So while recent Android versions most certainly offer encryption, it might not be enabled. iOS encrypted by default, as it should be.
I frequently see people with KitKat devices. Just because they aren't being sold by big parties now doesn't mean people don't have them, I can't make a global statement about Android devices the same I can about iOS ones.
I have some questions actually. Is it something you need to enable on Android? I seem to understand from the comment above yours that iOS has this enabled by default. If so, how do you actually enable it?
Yes, it's impossible to disable the disk encryption on iOS. If you don't set a passcode, the disk is still encrypted (but only with a per device key), this prevents recovery of data after an erase.
