Aadhaar is a 12-digit number issued to each individual by the Unique Identification Authority of India (UIDAI). It is an important document which is mandated by several organisations to access government-issued benefits and welfare schemes. Due to its vital importance, it is crucial to keep all of the information registered under Aadhaar up-to-date in order to mitigate discrepancies. So, here’s a step-by-step guide for changing the phone number in an Aadhaar card.