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Pinging just about anything, for me, just about always has no less then ten percent echo request timeouts. For the most part it's quite a lot more, like twenty five percent. Exceedingly rare is that I sometimes get as low as eight percent timeouts.
Now, this is at home, using my iOS 10.0.1 iPhone 7's Personal HotSpot via WiFi from my macOS Sierra 10.12.6 on my Mid 2015 MacBook Pro. It's reasonable to expect there'd be some lossage but I have by now convinced myself that it's not actually my phone's nor my box' fault.
(Note that GeoLocating my IP puts me in Seattle, so every fucking day I get all the local Seattle traffic reports, city council coverage, the occasional Crime Of The Century taking place in Redmond &c.)
There's a data center just upstairs from NedSpace so we get very, very good WiFi there but even so there are more lost packets than I regard as reasonable to expect.
Surely There Is Some Reason?
(Score: 1, Informative) by Anonymous Coward on Sunday December 02 2018, @04:17AM
The subject, quite simply, is the answer.
You are seeing, quite directly, why wired networking is superior if you care about reliable or performant connections.
Your packet loss is almost certainly simply the fact that wireless connections suffer packet loss.
And, in your case, you've got two hops worth of wireless. You've got the wifi between the macbook and the phone, and then you've got the wireless between the phone and the cell network. That's two hops worth of wireless interference and loss to sum together into a fair amount of lost packets.