Hi jiva
I have a Phantom 2 & a 3 Pro I have flown the 2 regularly with a friend who has a phantom 3 pro, we have both flown long side another associate with an Inspire. On the air field where we some times fly we have been in the air at the same time as several model aircraft.
The phantom 2 and 3 RC's operate on the 2.4 Ghz frequency as do most model air-planes (and mobile phones operate at 2.4 Ghz so watch out), we have never had any kind of interference, even from cheaper toys like the Hubsan X4 H107 which operate at 2.4 Ghz.
Some more knowledgeable pilots may be able to explain the digital encoding that protects the aircraft's control signals from cross-over interference, but I would say no worries, just look at Drone racing with several aircraft operating at the same time without interference.
Go out and enjoy....
Waylander