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As far as I know there are two possibilities to get this error message.One is poor signal of that respective network for which you just need to switch OFF and ON your mobile and the mobile will be able to receive the signal from near by tower.You may also get this error message when you are trying to insert a sim other than which the mobile is locked to.To solve this problem you need to unlock the phone from that particular network or use the same sim to which the mobile is locked to . You can unlock from ClassicUnlocking.com
If your Samsung phone displays an error message saying "SOS code" then your phone is probably network locked.To unlock it,visit the site ProUnlocking.com here they are providing the permanent sim network unlock code at reasonable cost with easy step by step unlocking instructions and unlock it.This is the fast and permanent unlocking method. http://www.prounlocking.com/samsung/rs16wp8/
want to unlock ur samsung phone??all u need is brain n ur fingers.... first click SOS beside the DONE button then confirm callnext hold the phone lock button(the button on the right side of your phone)the lock button would disappear...and keypad,phonebook,message buttons will appear at the bottom of your phone screenand lastly click on keypad button and dial this number*2767*3855#(it will show like *2767*----#...dnt worry)
click ok....the phone will restart automatically....:)....nd yuppiiieee......you have bypassed ur phone lock code....:)just comment n like if this post is helpful...regardsvijeta thakur
it is possible that your sim card provider has locked your account because of several missed attempt to unlock the sim on a new phone. all you need to do is call your telco provider and ask help to reset your PUK code. Goodluck!