Channel: Try using another channel, preferable 11 or lower. Note that due to legal reasons channel 12,13 and 14 is not available in all countries. If you're using the phone without a SIM-card or you don't have any network reception channels 12-14 is also disabled and 5GHz is not available.
By using the application Wifi Analyzer you can check what channel that would be best for you to use.
https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer
For instructions on how to change channel, check the user guide of the router or contact your router manufacturer.
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