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If your LG CU500 says Invalid Smart Chip,It's locked to some network...You need to Unlock it from service provider lock to use other CHIP(sim card)..find the current network,country it's locked now and get the unlock code from the site Simpleunlocking.com/lg-cu500/rs16wp9/ for LG CU500 and unlock it easily.
when the lg cu500 says "enter nck remaining: 5" means u need to enter an 8 digit number to unlock the phone. the 5 is the remaining 5 chances u get. once u use all 5 chances and keep entering the wrong code carelessly... u will then be prompted to enter a puk number which is only provided by cingular/at&t (as ive heard).
i have my old lg cu500 i am trying to find an unlock code without having to pay for one. a friend of mine needs a decent phone that works and mine is just laying around not being used. i switched carriers and cant use a gsm phone. im now on a cdma network. she doesnt have the money for another phone so this is why im trying to unlock my old phone to give to her.
now a days mobile unlock is very simple,thing is lot of source avail acrioss the globe,in order to that i found a unlocking zone where mobile unlock can be done just reach and find your need. http://www.onlinegsmunlock.com/
If you have de code, try this:
Enter non-Cingular SIM card,power phone off and than on.It will say on the screen "invalid smartcard" enter 159753#*# It will bring next screen-enter your unlock code and press OK.