I bought a Sony Ericsson Mobile (Model P990i) on 17th August, 2007 from Shopper's Stop, Rajouri Garden, New Delhi. My Mobile Serial No. is ALR000PCPK. Cash Memo No. of Shopper's Stop is 3424 dated 17.08.2007. This piece has being giving problems from day one. Whenever I dial a number, the phone hangs every now and then. This was bought to the notice of Authorized Sony Ericsson Service Center located in Nehru Place. They informed that the software in the mobile needs to be formatted and the same needs to be installed afresh. But still, the same problem persists which becomes quiet troublesome at times. I request Sony Ericsson to rectify th problem at the earliest. Someone mail me the contact numbers of other Service Center locations in Delhi as Sony Ericsson webpage has only addresses but not contact nos.