Hello If the sim card track/SIMCARD is missing /damage,a message will prompt you "INSERT SIM CARD".even if you have inserted the sim card.At this stage first of all you can clean the sim card slot/connector.Again if the problem persist the last solution is to contact mobile repairing shop.Because, it is very hard to repair it by yourself.If you want to know follow this link for details E71 insert sim full.Good luck
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Hello If the sim card track/SIMCARD is missing /damage,a message will prompt you "INSERT SIM CARD".even if you have inserted the sim card.At this stage first of all you can clean the sim card slot/connector.Again if the problem persist the last solution is to contact mobile repairing shop.Because, it is very hard to repair it by yourself.If you want to know follow this link for details E71 insert sim full.Good luck
Hello Smart,
Press the power button and you will find the option to activate the Nokia E71 Smartphone in online mode.