The CEO of contract assembler Wriston, Robert Hwang, said earlier this year that wireless charging on the iPhone requires the new models to undergo different kinds of testing. It also requires Apple to use a glass back on the new phones instead of a metal one, because the latter can block the necessary magnetic signals that are required when using a wireless charger.
Images of components allegedly used with the wireless charging pad recently surfaced on Chinese micro-blogging site Weibo. According to KGI Securities analyst Ming-Chi Kuo, Apple will be using the standard belonging to the Wireless Power Consortium (WPC), which is the group that supports the Qi wireless charging platform. Kuo says that Apple will make wireless charging for the iPhone an optional feature requiring the purchase of accessories for the phone. Gruber not only concurs, he adds that wireless charging might not be enabled for the new iPhone models until an update to iOS 11.1 is disseminated.