Reactivating my BSNL EVDO device after not using for 8 months

I want to activate my BSNL EVDO connection on this device which I was using 8 months ago. Later I discontinued the service but now I again use this service. Can I use the existing EVDO device or I have to purchase new one with plan ?

If can use this existing one then what is the process and how much activation charge will be there ?

Best solution is visit nearby customer care center of BSNL but I think they will not activate new number on this device but if is also possible that they can reactivate your old data account if it was not cleared.