https://consumerist.com/2017/09/14/applecare-now-more-expensive-for-big-glass-iphones/

On Monday, Apple announced a new batch of iPhones. What the next-generation iPhone 8 and the next-next-generation iPhone X have in have in common is glass all around, on both front and back, making them extra slippery. Apple has raised the price of its Applecare+ extended warranty and limited accidental damage program for some users.

All that extra glass means that Applecare+ is part insurance and part extended warranty, and both cost more for devices that are more expensive. The plan for customers purchasing new normal-sized iPhone 8, 7, or 6s costs $129.