This is Hari Krishna from Bangalore.I have switched from airtel to docomo by using number portablity feature. Previously mine also airtel corporate cug plan.No more additional charges for to migrate from post paid to prepaid other n/w.
The procedure is.
1.Send SMS from ur mobile with same sim to 1900 msg:PORT ur 10digit number
2.U will get sms from 1901 with uid.
3.Visit any retailer outlet/shop near by submit ur documents.Provide ur documents.They will note it down ur prev service provider & UID.
4.They will charge Rs:19/- for new sim and they will give new sim.
5.After 7 days night they will block ur current aitel sim same time they will activate ur new sim.
6.But u should be carefull with airtel after leaving after paing the all out standing also they didn't intimate u and they ask ur next service provide the bill payment is not done please stop the service like that.
7.Becarefull with airtel <i am suffering after 1 month from airtel/docomo)
8.In india all n/w providers are waste.They will blame each other and will create prob for us.