Chosen Solution
When I was taking apart my 5S, I accidentally ripped this connector: https://imgur.com/gallery/hsNI6 How will this affect the iPhone? So far I’ve reconnected everything and it seems to work fine.
Check Wi-Fi 5 GHz and 2.4 GHz including 3G / 4G. It’s for one of those antenna cables and if I’m correct one of them won’t work properly or have very weak signal.
