Hello, You have not mentioned any application or exam you want to know about. Generally one time password for anything is sent to your registered mobile number to ensure the safety of transactions or any other verification. There is no alternate way for you to know the OTP. So you need to have the device with you when an OTP has been sent to your registered mobile number.If that mobile number is with someone else from your family then you have to contact them to share the OTP with you for legitimate use.