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Your SIM card allows your phone to connect to GSM networks. When you insert your SIM card into a different unlocked phone, you'll be able to use your service on it. Similarly, if your phone is unlocked, you can insert SIM cards from different carriers into it, which can be useful when traveling.
Typically issue with the sim card. Try to use the sim card in another phone. Also try a different sim card in your Samsung. If the same sim card does not work in a different phone, contact your carrier. If a good sim card does not work in you Samsung, contact Samsung or where you bought the phone from
Friend the problem is your power switch.it is shorted or disconnected.
or the hardware called CCONT power supply.it needs resolder ot
reheated.ask for mobile techincians help for this hardware probs.good
transferred all my files onto my computer, then proceeded to format the memory card whilst in the phone. transferred all the files back onto the memory card and bingo the music player works fine. Strange that the memory card was from my samsung e900 and worked fine.