Apple Users:
Copy your Nagish number from the Nagish app -> It can be found in the settings tab under your name.
On your device: Go to Settings -> Phone
Select "Call Forwarding"
Toggle the switch on
In the text field paste your copied Nagish Number
Hit "back" (<-) to return to the previous menu.
You Are done!
Android Users:
Copy your Nagish number from the Nagish app -> It can be found in the settings tab under your name
Launch the phone app on your device
Click the three dots or the menu button (3 lines)
Select "Settings"
Select "Call Forwarding"
Select the "Forward all calls" option
In the text field, paste your copied Nagish number
Click "Activate"
You are done!