That is interesting, and thank you for correcting me. I have not been on a phone team for a couple of years so it looks like my knowledge is obsoleted. On accelerometers though I have to say that doesn't match what I see working in the electronics indiustry. Chip accelerometers these days use MEMS; those are semiconductors basically with tiny tuning forks made from silicon. They are non-magnetic. They are used in many products for example, drones use them too. Their information can be combined with separate Hall effect magnetic sensors.