SMS Port < space > < your 10 digit mobile number > to 1900 for your UPC code. You can generate the UPC code even while on roaming.
Please note, the UPC code is valid for 15 days only.
Please ensure that the UPC code is valid for at least 9 days at the time of filing for a request to port to Tata Docomo for smooth transfer.
Do's and don't: