Never had a Blackberry or Android so don't know. Have had an iPhone for six months now and don't notice a difference.

Any clue?
iPhone owners get more sex than other smartphone users, according to a recent study by OkCupid. The study which complied data from three types of smartphone users (Android, iPhone & Blackberry) showed that iPhone owners have in some cases double the number of sexual partners to other forms of mobile users.
Women led OkCupid’s study in all categories, having more sexual partners than men regardless of the kind of phone they had.
However even though women had more sexual partners than men in all categories, the differences varied greatly depending on the type of cell phone in question.
Female iPhone owners for example had around 12.3 sexual partners by the age of 30 while the males were two points behind with an average of 10 partners. Android users on the other hand enjoyed a much smaller gap with women having around 6.1 partners compared to men with an average of 6.
So does an iPhone guarantee you more sex? Unfortunately for those thinking about purchasing an iPhone, the link hasn’t been scientifically proven. However, despite the lack of concrete evidence, there is little doubt that OkCupid’s survey will influence the sales of iPhones over the coming months.
According to comparison website compareaholic:
“While scientists have yet to confirm the link between an iPhone and notches in the bed, for the time being this study will be the closest to scientific evidence around. For those thinking about getting an iPhone, why not get a pack of condoms as well? There is no clean suggestion as to when the sex starts happening, but there’s no harm in being prepared. And if you’re going to be flaunting it around, be sure to take out iPhone insurance. Without it who knows where your sex life will go”.