ESP8266 S01 WiFi Scan Issue

Development Tools IDE 1.x
1

Hi folks,
I am very much new to IoT/ESP8266 world. just because I am curious about the IoT future I started my hands in ESP8266. I bought a ESP8266 S01 module form robu.in, along with that to interface it with USB, I bought a 340G USB to serial module.
Initially its working fine with Arduino IDE 1.8.

tested many AT commands, returning as expected.
then, flashed the Bling sketch. its also working fine.

but unfortunately, the Wifi Scan sketch is not returning any network, even though I am surrounded with many networks. my personal hotspot is some 2-3 inches away.

every time its returning 0 network.

I tried Soft AP mode, its becoming ready, but the AP is not visible in mobile.

I would appreciate any resolution of the Wifi scan issue.

2

Which WiFiscan sketch ?
Please use CODE TAGS to post it ( </> )

From which Library ? ( attach a working link using the chainlink )

This is primarily and ARDUINO help forum and you might get slightly better answers on an ESP8266 forum.