Why on iPhones the forum is displayed using half of the screen when the phone is held vertically? Also, the portal home page from Simple Portal is not displayed on either iPhones or Android phones. All this works fine on tablets.
As you should clearly be able to see on your own from the screenshot, you broke the template yourself, by putting an oversized ad on top of the forum...
You need to make so the images resize.
Which, in ads, is not always going to be ideal.
The best idea, would be to add the ads in a way that they don't show on mobile, if that size.
Or show smaller ones for mobiles ;)
Ads not being responsive was the problem. Thank you very much! I will ask about the portal in the Simple Portal add-om thread.