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Nearly all service work is done with the magnetic field up as ramping down is a massive deal. iPhones and iPads work fine until very close and it’s what the documentation is kept on for the vendors I know (Siemens and GE, Philips use Microsoft gear). Philips require photos of the cold head, which is pretty close in. Get too close to the bore and they turn off for a bit, which is probably due to cutting flux lines quickly. Id suspect it doesn’t help their lifespan but I’ve yet to see it kill a phone.