Just show them the articles about Apple fighting against jailbreaking and saying it voids the warrranty, whereas a webOS phone basically is the perfect phone for hacking, homebrewing, and customization.
Originally Posted by blackfireball5
In fact, one of the most popular iPhone hacks is to put a user interface on the iPhone that is just like webOS. Imitation is the sincerest form of flattery.
Here they are on iOS4 and they just now added the ability for the user to change the wallpaper...
look around u-tube. there is a side-by-side video showing both phones doing the same task to show how much easier and more powerful webOS is.