It is necessary to link your mobile number with your Aadhar card. If you have changed your mobile number and have not updated it in Aadhaar, then do it as soon as possible. No documents have to be presented or shown for updating mobile numbers. We are telling you the process to update your mobile number in Aadhaar.
Most of the government schemes in the country have been linked with Aadhaar. To take advantage of these facilities, whenever you use your Aadhaar number for the verification process, an OTP is sent to your mobile number for the same.
This OTP is sent to your registered email id only. In such a situation, if your mobile number has changed, then this OTP will come on your old number only. And then you will not be able to complete the OTP process. This may give you trouble.