I purchased one Samsung Duos 259 model on 7th Aug.2010. After using for 3-4 days I foud that there was only 20-30 minutes talk time backup. I visited Companeys service centre ASC TELE CARE 14/18 L.B.S. Marg, Civil Lines Allahabad, E-mail: [email protected] Pnone No. 979270735 many time where I was told that there is no battery in the stcok come later. After many trips my battery was replaced by the service for which nothing was given in writing. After my repeated request they note down the battery number on my mobile phone receipt. After... read full review »