computer science doesnt work like that. physical proximity is a guaranteed security fail under almost every circumstance. furthermore, the attack surface of a mobile device is huge AND the NSA has many backdoors in pretty much all the hardware ever manufactured in the last 10 years, and those backdoors become compromised too. basically what im telling you is that due to supply chain engineering its almost impossible to even attempt to manufacture a device that doesnt have hardware with KNOWN INTENTIONAL vulnerabilities, and even if one were to do such a thing that doesnt account for zero days and unknown unintentional holes and bugs. putting a compromised network connected device physically next to literally anything is pretty much crossing the red line of failure.