Frnds mere pas Samsung Galaxy J1 Mobile hai, Is mein 2 Sim lgti hain, problem ye hai k jis sim pe main 3G anable krta hon wo Sim bilkul theek chalti hai but jis sim pe 2G anable hota hai os pe na koi call sms ata hai aur na hi jata hai , koi b call ya sms send kro to error a jata hai "Not Registered On Network" . Main ne Mob Reset b kia hai but problem not solved. Software b Updated hai.. Net se search kr k b kuch method try kiye hain but problem solve ni hoa.. plz Help me..