Consumer Intelligence Research Partners said their analysis found 59 percent of iPhone users have monthly bills of more than $100, with 10 percent paying even more than that, approaching $200 a month.
A little over a third of iPhone users pay $51 to $100, the firm said.
In comparison, 53 percent of Android phone users pay more than $100, while less than a third pay $51 to $100.
While iPhone users may be paying more monthly than Android users, wireless carriers are probably making about the same or slightly more money from Android users overall because of the differences in device subsidies, which run about $450 for an iPhone, ArsTechnica reported.
"Given the subsidies on iPhones, the carriers are working hard to make their money back during the course of the contract," CIRP's Josh Levitz said. "With the exception of perhaps the hottest Android phones, we think the subsidies on Android phones are lower, so the carriers make more money even with slightly lower per-subscriber revenue."