How to change UPI number in Paytm?

To change your UPI number on Paytm, you must first update your mobile number with your bank. Once updated, open the Paytm app, tap your profile icon, and go to UPI and Payment Settings. Deregister your existing UPI profile and then re-register using the new mobile number. This will link your new number to your bank accounts and create a new UPI ID. Ensure the new SIM is active in your device for SMS verification.