Why does my iPhone 16 Plus experience electric shock at the camera control button while charging?

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If it is just a big shock and just a tinteling sensation it is normal. You might want to not touch the iPhone when it s charging

I have a case on my iPhone so I don’t feel it, but when charging my MacBook i also feel this tinteling sensation

It can be that you feel a bit tingling in the titanium .If it really is a big shock you might want to have your phone looked after, that is not normal