Ok first of all iPhone has internet and some of us who don't spend slot of time at home need to use it.
The reason I can still post because my computer and iPhone is not logging me out. I log out I sign in on there web site and when I click sign in again after I fill my details the page just refreshes and goes back to square one. So I have to fill my user name and password again press the sign in and it goes back to the same thing again. So it does not matter where I do it from you know all.