I keep getting unknown caller several dozen times a week at all hours. There is no number left on the call log so I have not been able to block the calls. The call can not be answered even if I try and there is never a message left. My phone is a Samsung A11. Do I need to get a new number to make the calls stop. I have tried several call blocker apps, none have been able to stop the frequent "Unknown caller" message. Is there an App or suggestion to help. Turning off or airplane mode does stop the calls..