Chosen Solution
my iPhone 6s can’t connect to WiFi and any Bluetooth device
There are a few things this could be and more details will help, but this page for iPhone Won’t Connect to WiFi has a pretty extensive list of fixes.
If Wi-Fi and Bluetooth are still having issues, then go to Settings > General > Reset > Reset Network Settings. This resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you’ve used before. If you’re still having trouble, Contact Apple Support. Regards, Will
Hi Raji, I would suggest to do network reset if it’s not working then you’ve to repair the phone with Tenorshare Reiboot ( the most easiest tool).