I had that kind of problem b4 with w85oi.... Here's what you can do. You know where you put your sim. Try to insert it properly. you must hear a "click" which mean u have properly inserted your sim card. I am just not sure if i had a same kind of error message saying "sim inactive" I forgot what exactly the error message but something to do about the sim card...note: ur nail must be long to put the sim proprely...its funny but true.