You need to download and register for UPI on Freecharge on the new device.
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Can I receive money without setting a UPI PIN?
I don’t remember my UPI PIN for the account. What do I do?
How can I change UPI PIN for my account?
What is Freecharge UPI?
Can I send money without setting a UPI PIN?
When will my account get debited when I send the money?
Where can I see all my past transactions?
What if I change my mobile handset and want to use Freecharge UPI on the new device with the same number?
You need to download and register for UPI on Freecharge on the new device.