ANSWER: Mobile phone number
Explanation:
- JAM number trinity refers to Jan Dhan Yojana bank account number, Aadhaar number (a unique number to identify every resident with biometric details) and Mobile phone number, respectively.
- The application process for a bank account under the Jan Dhan Yojana places priority on Aadhaar number as identity proof.
- Aadhaar enrollment requires the applicant to produce his/ her mobile number.
- Once the linking is complete, every poor person can be uniquely identified by his/ her Aadhaar number, the cash can be sent to the linked bank account and the account holder can either withdraw the money from the bank or use his/ her mobile phone to collect the cash from designated agents such as village retail shops.