Several users have concern whether bhim app continue to work if they change mobile carrier (telecom service provider). Answer to that is YES. There is no issues at all even if you change your telecom service provider. You can continue using bhim app and make transactions as usual.
For instance if you are currently using Reliance as a your mobile carrier company and you recently ported your mobile number to Airtel, Vodafone, Idea or any other company, you can continue using the same mobile number with bhim app to send and receive payments without any issues.