The problem zk-mobile number verifier solves

Eliminiates bot accounts to a degree as the user has to have a off-chain phone number to send to the trusted verifier. Provides anonymous state-wise/area-wise filtering by using a zk-circuit and spitting out an area code for a given mobile number.

Verify on chain ethereum accounts with 2fa phone no

Challenges we ran into

Sorting and building the zk-library based on the subscriber mobile template and splitting the library into 4 parts because a single solidity file was exceeding the contract size. Overcame it by splitting the template into 4 seriers (6,7,8,9-series)