>Because OG2 satellites are launched in groups of several spacecraft, they require propulsion systems to place the satellite into different nodal planes to begin operations.
There's the answer, courtesy Orbcomm.
Say one satellite's orbit is a bit smaller. That means that, over time, they will naturally drift farther and farther apart, until they end up on different sides of the globe. At that point, just raise the smaller orbit slightly.
Kerbal Space Program is really good for understanding stuff like this.
Only mid-launch I figured out I could just put three of them on Kerbisynchronous Equatorial Orbit at 120° phase difference :/.
Yes, KSP is absolutely amazing for learning this stuff :).
[0] - useful if you're playing with RemoteTech mod, which prevents you from operating unmanned spacecraft if they don't have a radio connection back to a proper command centre.