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Check whether your sim is placed properly in the slot. Try to reinsert the Sim. Still if you face the same problem then your phone might be locked to particular Network. To solve this problem you need to get it unlocked. You can unlock your Samsung i9003 phone using unlock code. You can get the unlock code for your phone from your Network service provider or any third party online vendors like Unlocking4U.com here you need to specify your country, current Network name, IMEI number of your phone. Then they deliver unlock code to you through mail with unlocking instructions. Using this you can unlock your phone from Network lock easily
Good place to get a unlock code for your Samsung SGH-A737 model mobile here Classicunlocking.com , it gives you a step by step instructions for getting the unlock code for your samsung mobile from the network lock.......
Type *#9998*627837793# Go to the 'my parameters' and there you will find new menu where you can unlock phone.(not tested-for samsung C100) To unlock a Samsung turn the phone off take the sim card and type the following code *#pw+15853649247w# . Java status code: #*53696# (Samsung X600)
If you want to unlock your phone put a sim from another company then type *#9998*3323# it will reset your phone. Push exit and then push 7, it will reset again. Put your other sim in and it will say sim lock, type in 00000000 then it should be unlocked. Type in *0141# then the green call batton and it's unlocked to all networks. This code may not work on the older phones and some of the newer phones. If it doesn't work you will have to reset your phone without a sim in it by typing *#2767*2878# or *#9998*3855# (not tested)