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20/40 coexistance
Can somebody please explain me what exactly is happening when "20/40 ceoxistence" is sheched, and when it is not? If it is unchecked, is that means that only 20mhz works, or only 40mhz?
Just leave the option checked. The router will conform to Wi-Fi standards. Besides, iPhones will always insist on using 20 MHz, so the router will comply. You can use Wi-Fi Analyzer for Android or Acrylic Wi-Fi for PC. I'm sure there are other programs.
This setting governs the router's use of 20 MHz and 40 Mhz wide Wi-Fi channels in the 2.4 GHz band. Wi-Fi standards mandate that routers must use 20 MHz channels whenever neighboring Wi-Fi networks are detected or when clients request it. When this setting is enabled, the router will comply with this requirement.
If this setting is disabled, then router may not necessarily drop down to 20 MHz.
It's very unneighborly to use 40 MHz channels because it consumes 2/3rd of the available spectrum, so you should leave this setting enabled.