I had not been using my Nokia 7210 supernova for about an year.One day I try to charge it and after a few minutes,it became fully charged.When I start browsing internet or play music on it,the battery charge goes straight to empty and get switched off.When I removed the SIM card and turned it on,it has full charge.How can I fix this issue ? Is this the problem of software or battery ? Can any shops repair it ?