@AshBrar - If you are not on an unlimited calling plan, are you a new customer or have you had working services before this?
Try restarting your phone or perform a reset of the device' network settings.
Also, can you try your sim card into another phone to see if outgoing works?
Perform a Reset of your device's Network Settings.
This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.
Iphone:
To Reset Network Settings, begin by opening the Settings app. Next, tap General -> Transfer or Reset iPhone -> Reset -> Reset Network Settings. and enter your passcode.
Your iPhone will reset network settings and restart itself.
android:
Find and tap Settings > System > Advanced > Reset options > Reset network settings.
