It's not yet official yet

Truecaller install and then block

Switch off phone push camera with your finger, switch on while finger on camera. the try it may work.

which you are trying to connect your phoneCheck and make sure the phone is not facing any problem just because the Wi-Fi antenna is not performing the signal reception and transmission properlyDo check if the router is placed far away from the phone ...

A second hand S7 Edge is still 100 times better than a K20 Pro..