According to Macleans’ blog, there is a patent fight between Apple and Samsung, which are two largest smart phone companies. These two companies all argued that opponent made infringement.

      
From my perspective, it is inevitable for smart phone companies to have overlap. For example, the recent ios.7 system is quite similar with android system. The new system does not like Apple’s style at all.
The lawsuits of patent fight costs two companies a lot and I think they should not pay attention to the patent competition but should focus on new technology research. Besides, each companies should find their uniqueness and make innovations from the old and unique products.