Lawsuits abound in the current mobile telecom industry. Rather than try to explain things on a case-by-case basis, it seems easier to just say "everybody's suing everyone."
The folks at Information is Beautiful have created an infographic that attempts to visually provide information about the ongoing legal minefield. Their graphic provides some useful visual cues: size of company's graphic indicates revenue; color of company's graphic indicates whether revenue is rising or falling; and arrows indicate whether lawsuits are resolved or ongoing.
It's still a tangled web woven by executives and lawyers, but the information is a little easier to suss out this way. If only we didn't need this graphic because everyone realized that competition is part of the business landscape.