If you cut off the wireless charging copper coil on the back cover of the Apple 11, it will seriously affect the function and effect of wireless charging. Wireless charging copper coil is an important part of receiving wireless charging signal and converting it into electrical energy to supply battery charging. If the wireless charging copper coil is damaged or cut, the phone will not be able to wireless charge normally, you can only charge through wired charging.
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Please note that cutting or damaging any internal components on the back cover of the Apple 11 is considered an illegal modification and a violation of Apple's warranty, which will void your warranty. If you have any questions about or need repairs to your Apple products, be sure to contact Apple customer service or visit an authorized Apple retail store for professional help.