In the flights I've taken in the past few years, I see wifi on about 1/3, and it's a fairly recent thing (a couple years, maybe). Obviously you're traveling on different planes than I am.

Really depends on: country, airline, price range you are willing to part with on amenities. Typically the Wifi costs extra, and most people are just trying to A-to-B it.

I fly probably a 15-20 times a year and I've never been on a flight with wifi. I'm super curious what it's like though.

90% of the time it's like really bad coffee shop wifi unless you get a nice airline with ViaSat connections installed, then it's actually pretty good.

Good enough to make calls via VoIP?

No, these satellite connections have bad latency and VOIP traffic might be filtered out.

I'm in Europe, and fly 4-5-6 times a year. It's only in the last 5 years that you're allowed have electronic devices turned on in planes here.

Huh? I'm sure electronic devices were OK in Europe flights a decade+ ago...

Yeah and you still get "told" to turn them off. Kind of a mixed signal of "put your electronics on airplane mode" and "switch off your electronics" where you're not sure which you're supposed to do. Really they don't care either way

I think you are referring to take-off/landing parts of the flight.

There is a reason behind that, AFAIK the airplane uses lots of sensors that these devices may interfere with, otherwise normally they are allowed.

Out of curiosity, why were electronic devices banned in planes on the first place? Is there any scientifical evidence either for or against it?

Great article here: http://www.bbc.com/future/story/20130604-why-we-turn-devices...

Also good: https://en.wikipedia.org/wiki/Mobile_phones_on_aircraft