Will consumer adoption of unlimited mobile plans cause your call quality to suck? ABI Research seems to think so. In a report released today, ABI Research says unlimited plans can lead to more phone calls, more data use and worst of all, more YouTube-related video streaming. And that leads to more of a burden on wireless networks and backhaul. Since Sprint’s unlimited plan includes 3G data as well as voice, it may be the canary in the coal mine for other carriers waiting to see what unlimited means for their networks.