Vodafone has already launched 4G services in 17 states. Here is process to swap and activate your 4g sim.
1.) Get a 4G sim from any vodafone store by giving the requested matching documents(I don’t think they ask for it any more) and sim fees(if any), I got sim free.
2.) Don’t take out your old sim from phone yet. Send sms your existing Vodafone sim to 55199 write
“SIMEX < 19-20 digit 4G SIM card number printed on New sim card itself>”
3.) You will receive a reply from 55199 with half SIM number entered asking you to reply with remaining six digit sim no.
4.) You have 2 hours after receiving that sms to send remaining 6 digits of sim no to 55199.
5.) You’ll receive sucess sms in next 5-10 minutes if not then start from step 2 again.
6.) Now wait for network to disappear and change to new sim only after that. Enjoy 4G!
I think vodafone process can be little cumbersome for some people as you need to send sim no twice which can confuse many people. Airtel got a better process where you need to send sim no just once and confirm with a 1 that’s it.
Update: I just visited voda store here in Delhi, the rep just asked me my mobile no , entered it in his system and gave me a prepaid 4G sim and asked me to do step 3, 4 and 5 in front of him. Thats it.