How it Works
MagSafe for iPhone is a bundle of component technologies that includes a magnetometer, wireless charging system and a single-coil NFC loop.
When Apple introduced wireless charging in 2016 with the iPhone 8, the feature works great if your phone is directly aligned with the coils inside most wireless chargers. But if it's misaligned or gets bumped, the phone will charge very slowly and sometimes not at all.
The magnetometer embedded in Apple's cases for the iPhone 12 solves this problem by sensing and aligning the phone to the charging coil. This assures a consistent and rapid recharge.
What does it do?
Magsafe for iPhone 12 still has limited accessories, a check at Apple website shows that there are some casings (with wallet) and snap-on chargers, that's all.
Yes you should be concerned with Credit Cards, Heart Pacers (any devices which will be 'impacted' by strong magnets). There is a lot of people who cautioned against placing your credit card in the same pocket as your new iphone due to this feature. So ladies, if you are putting your new iPhone 12 into your handbags, try remember not to put them into the same compartment as your purse is to avoid any interference with your credit card or bank cards' chip.
