Yes you can change your vodafone no to airtel no:
* Contact the new mobile Service Provider to whom you want to port your mobile number.
* Read the eligibility and other conditions carefully.
* Obtain Customer acquisition From (CAF) & Porting Form.
* If eligible, Obtain ‘Unique Porting Code‘ by sending an SMS from the mobile number you want to port to the number ‘1900’ with text ‘PORT’ followed by space followed by your 10 digit mobile number you want to port.
* Fill up the CAF and Porting Form.
* Submit the duly filled Porting Form and CAF along with requisite documentary proof of the mobile service provider.
* If you are a post paid subscriber, submit a paid copy of the last bill issued along with the Porting Form and CAF.
* Obtain new SIM card from the new service provider.
Subscriber can withdraw the porting request within 24 hrs of applying.
Activation of Ported Number
* Subscriber new mobile service provider will intimate you the date & time of porting on your mobile phone.
* Replace the old SIM with the new SIM provided by your new mobile service provider after the specified date and time.
Enjoy:>