Hmm. Depends what you're referring to - iPhone is indeed a closed system, by contractual arrangement, but Android isn't, and it absolutely is feasible for third

Hmm. Depends what you're referring to - iPhone is indeed a closed system, by contractual arrangement, but Android isn't, and it absolutely is feasible for third party Android devices to exist. Occasionally someone does a new phone startup. Not especially a matter of patent, just good old fashioned contract exclusivity.