According to a new report from Consumer Intelligence Research Partners (via AllThingsD), iPhone users are currently spending the most on average for monthly carrier bills. The research firm polled smartphone users between October and December 2012 and found 59 percent of iOS users spend over $100. Ten percent, of which, fall in the over $200 per month category. That’s compared to the 53 percent of Android users who spend over $100 (7 percent over $200). According to CIRP, it’s not iPhone users’ usage habits but instead more expensive data plans thanks to higher subsidies paid by carriers. That’s something T-Mobile hopes to change with its upcoming monthly installment plans, but other major carriers are also apparently very intrigued with the idea.