There are rumors claiming that iOS 5 is going to enable FaceTime over 3G, or that the service might launch with a future version of the iPhone. Now, we’re hearing that Verizon isn’t happy about unlimited data plan customers accessing such a feature, if does indeed launch later this year. Instead, the carrier only wants customers enrolled in the tiered, limited data plans to have access to this feature. Apparently, this is because Verizon is worried that “America’s most reliable network” might struggle to cope with FaceTime over 3G if everyone – even unlimited data plan customers – are using the service. For this reason, it’s pushing to limit the service. Apple, on the other hand, isn’t happy about this: Instead, the Cupertino, CA company would sooner see every Verizon customer enjoy the service, rather than just those on a limited data plan. According to 9to5Mac, the companies are in the process of coming to an agreement. We’ll keep you posted.