Facing a peculiar situation of exhausting 10-digit mobile numbers, C-DOT, a research and development organization of the telecom sector is studying weather the following number could be used as a mobile number. Which one?

With India's mobile subscriber base growing rapidly, the 10-digit numbering plan was facing exhaustion. C-DOT explored using Unique Identification Numbers (Aadhaar) as an alternative to traditional mobile numbers, as Aadhaar provides a 12-digit unique identity that could potentially serve as a universal identifier across services.