My phone can't see Wifi 2.4 Channel 13. Why? How can I fix it?
I have an android phone (Moto E4, Android 7.1.1, Not rooted) that was purchased in the US about 12 months ago. Just after purchase,I came to China for a few months, and it worked perfectly on the Wifi here in my home. I had a Chinese sim card. I don't know what channel my home Wifi was working on last year.
In September, I returned to the US and swapped out the sim card for a US carrier. It continued to work perfectly.
I have just now returned to China, and my phone no longer can see the wifi signal in my home. When I look on my PC, it shows that the Wifi is transmitting on channel 13. When I look in my android app "Wifi Analyzer" it shows a blank space for channel 13. (Also, I forgot my Chinese sim card in the US)
Is this a hardware or a software issue? How to fix this?