How do i fix Wi-Fi on iPhone 6?

Already reset iphone network settings and reset the Wi-Fi router even though the problem is my phone as the Wi-Fi doesn't connect properly on any Wi-Fi. Phone is on the most recent software

Little known issue. On a few routers, if your Wi-Fi channel is set to Auto, it absolutely sucks for the iPhone 6. Set it to 1, 6 or 11, depending on which one is clear in your area.

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