The Aadhaar Number/ UID would be issued to every individual resident in India that satisfies the verification process laid down by the UIDAI, including NRIs, and foreigners residing in India. The physical presence in India for providing fingerprints and other bio-metrics etc is necessary. Aadhaar UID doesn’t establish citizenship and is not only for Indians.
Related wiki articles:
UIDAI HelplineToll-free number – 1800-180-1947
Email - email@example.com