OCI/NRI/FOreign national who are not resident of India (staying less than 180 days in a year at current address) are not allowed to have aadhaar card.

How are they suppose to link their SIM to aadhhar?

Friend spends 3 weeks in India and 10 weeks in US every quarter. Permanent Indian mobile phone number is becoming essential not just for convenience at airport but for other items such as Ola, online banking, debit cards (many companies need that for OTP) etc.

Any suggestions?

Separately, neither the Supreme Court order in Feb nor Ministry of Telecom memo in April seem to mention need for Biometric verification, but airtel/idea seem to insist on one. Any workaround for this? (especially for immobile patients who survive on mobile phones)