I really don't get the patent argument for technologies embedded inside the chips sometimes.
If I buy a computer with an AMD cpu that contains IBM or Intel patents, I expect that AMD are responsible for any license payments, not the manufacturer of the computer system. Therefore then the manufacturer of a modem chip that implements the 4G signal (whether that is a stand alone chip or part of a SoC) should be responsible for payment based on the price of the chip, not the company that puts that chip in a phone.
If I build a small IoT sensor that uses chips that include patented technologies, how would I know if any relevant licenses had been paid? and should I be liable if they were not, having bought the chip in good faith?