Sometimes while you are dialling a number, you may experience that your Call is not getting connected. To overcome from this issue, you can do the following steps :1. Ensure that the phone number and area code you are dialing are correct.2. Network problem could cause this problem. Hang up and dial again or move to another area.3. Remove the SIM card and then check by reinserting it.4. Check with other SIM card.5. Change the Network operator search and check.For Marshmallow OS version and above :