lol
There's so many patents, you can't make anything without infringing on someone's patent. The big companies leave each other alone, mostly, because they have agreements like "you can have a button to answer the phone if I can have an antenna that works" but if a small company tries to produce anything, they can get screwed by all the big boys that own patents for basically everything to do with a phone.
Meanwhile people like me are afraid to write software for the same reason... Success = sued.