First time I taking imrates Id that mobile number...

We would like to inform you that According to Federal Authority for Identity and Citizenship (ICA), the Emirates ID card holder must report any change in his/her details of the card to the competent department in ICA within one month from the date of change.
In order to modify any details related to an existing and valid ID card, you are required to visit one of the ICA’s customer happiness centres with your original passport and the Emirates ID card.
Note that the details related to an existing ID card cannot be updated online. This applies to Emirates ID cards issued to nationals and expatriate residents.