How to know my own airtel mobile number

  • Hi

    I take a new airtel connection last week. My primary sim is bsnl and inserted secondary sim as airtel. Today I tried to login paytm with my new airtel connection. Unfortunately I don't know my new airtel connection number. Because I only use this airtel sim for 4G data. So I don't know the sim number. How can I retrieve my own airtel number. Replay please