(CNN) - The iPhone has been a huge success for Apple. But are customers who use them left to pay the biggest cell phone bills?
New data from Consumer Intelligence Research Partners (CIRP) says iPhone users pay the highest monthly bills.
Around 60 percent of iPhone users polled said they paid more than $100 per month for service. Only 50-percent of Android users fell into that same category .
Blackberry and Windows Phone users paid even less.
CIRP says the reason is most likely due to carriage fees that the cell phone companies have to pay.
Overuse, researchers say, is most likely not the cause.