1) Please, NEVER EVER assume you know how the fonts will look on the users device. The iPhone is not the only "mobile platform" out there, and it doesn't even have the majority. Different phones will have different fonts, different default font sizes, different screen sizes, etc. As such "user-scalable=no" will guarantee people all over the world will hate you, including iPhone users who have a different opinion than yourself on what the "right font size" is. Just saying: "I'm using bigger fonts than on the web" will probably push you in the other extreme, with fonts too large and users unable to scale them down.
In conclusion: ALWAYS use "user-scalable=yes". Like this you'll give the user the option of correcting your assumptions if they turn out to be wrong.
In conclusion: ALWAYS use "user-scalable=yes". Like this you'll give the user the option of correcting your assumptions if they turn out to be wrong.
Thanks for the article otherwise.