Due to wireless charging, Apple had to replace the rear metal panel with glass on new iPhone models, and with addition of glass, there is a higher risk of breakage in the event of an accidental drop. The only problem is that the repair of a broken rear glass panel costs more than the replacement of screen.
According to AppleInsider, a broken back-glass does not qualify for a $29 screen replacement and instead, users will have to pay $99 for the “other damage” fee, plus tax. After two incidents of accidental damage a higher replacement cost is charged, which is $349 for the iPhone 8, and $399 for the iPhone 8 Plus.
