Android, Apple, and BlackBerry all have distinctive branding and logos that people are more than happy to exhibit on their person. In fact, certain behaviors--such as tattooing said logos on one's body--are so extreme that they can even be considered a form of behavior control.
Android has that adorable little Android robot. Even though it doesn't have a name, it's everywhere. It's on t-shirts (intact, deconstructed, or taking a chunk out of Apple), stickers, and even tattoos. You can also buy the little guy as a plushie--if you feel so inclined. That little robot brings Android to mind every time we see it.
Apple's logo is pretty iconic. Not only does Apple ship white Apple decals with all of its products, you can also find the logo on everything from lapel pins to license plate frames to people's skin and in their hair. And that logo means something: innovation, the coolness factor, good taste, forward thinking.
BlackBerry's logo isn't as prevalent as Android's robot or Apple's apple, but that doesn't mean BlackBerry fanboys aren't willing to waive their geek flag high. If you look hard enough you can find BlackBerry t-shirts and other BlackBerry logo gear, and at least one guy has a tattoo of a BlackBerry Storm on his shin (with the words 'iPhone Sucks' below). Generally speaking, though, BlackBerry users are more interested in buying accessories for their phones than in promoting their devotion in symbols, banners, flags.
Cult Trait #3: Promoting Difference, Not Diversity