Not at the consumer level. Although I suppose it would be possible to custom program something using a raspberry pi or something, to connect via cell towers... the issue would be latency I would think... "conventional" radio control can mean several things... I have flown my "drone" out to about 5 miles from my location.. and there are products out there that will allow even further flights via "conventional" radio control... so don't be so quick to dismiss it! Do a search for Long-Range FPV RC, I am sure some answers will come up...Now, that being said, I don't encourage using this to fly over populated areas.. last thing our hobby needs is someone to hurt a kid by having thier "drone" go bonkers over johnny's birthday party... if you were to pursue long range RC, learn to fly normally first (line of site), take baby steps towards long range, and do it SAFELY. Common Sense! Also keep in mind, the FAA has stated, that, any "rc aircraft" flown beyond line-of-site falls under the regulations of an "aircraft". Meaning, at this point, its illegal to fly it beyond LOS. (big battles being waged on this one right now in washington). It's immediatly illegal because, obviously, your "drone" does not have an airworthiness certificate, etc etc. and likely the "pilot" is not a licensed pilot with currency, and a current medical either!
I suspect things will change this year (2015), with more firm definitions, and regulations, on where "hobby" ends, and "commercial" begins, along with the steps necessary to fly "commercially". We ar ein the infancy of the drone revolution, and great things are to come! BTW, don't take this to mean I am opposed to govt regulating drones.. FAA NEEDS to implement some form of regulation, these things CAN be dangerous, especially to other aircraft. However, they also need to look at the ways hobbyists use them, vs the way they would be used "professionally" and act accordingly.. Where those lines blur (long range RC, First person view flying), we have to err on the side of human life, and ensure airspace deconfliction...