Nokia C1-01 insert sim is a very simple solved problem.first checked out the battery is it properly connected to the center point of battery connecter.Because some time battery not properly connect to the center point of battery connecter and mobile phone give a message insert sim cared.if your battery properly connect to the battery connecter.Then you open the mobile phone with mobile phone tools and follow this diagram and solve the problem.
(1).Change the sim IC ( i show you on the diagram).
(2). Jumpring the sim ic as a diagram.
