@Sushubh, port binding basically binds ur telephone line to ur broadband account..so ur username/password cannot be used anywhere else other than ur own line..so all those guys using their office account at home and vice-versa will not be able to do so in the near future..Port binding was there only in mumbai but now it has come to Delhi as well..@gavnit i can confirm it coz i got a call from the bras server room and the engineer who spoke to me confirmed that it has been done and any remaining exchanges will be covered soon..the same thing was confirmed by an engineer who visited my house..besides the problem i faced was also due to port bindingPS Gavnit be careful nobody can give a time-frame when it will be done in ur exchange but if ur using ur unlimited at that time when they implement it then u'll be stuck with a huge issue..