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U600 unlocked i found a u600 i took the sim out straight away and put my o2 sim in. the fone had been unlocked on all networks and was working fine until the next day and now i cant call out from the fone or recieve calls or send or recieve texts. has anybody got any ideas please help.

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Re: u600 unlocked

Perhaps the phone was reported lost/ stolen by the previous owner... if that is the case, the phone would lock, and not be able to work

Posted on Sep 26, 2007

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My samsung u600 says limited service when it is an o2 phone i have an o2 sim card in it what can i do

if your phone is saying that limited service it means your phone has been blocked by the network.

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Sim lock comes up on screen

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Limited Service ???

what has happened is that the original owner has reported it to O2 and they have applied an IMEI bar to the handset that will be circulated to all uk networks. So unfortunately the phone is now useless! Dont bother spending money trying to unlock as you would be wasting your money once all the networks know. It probably worked for a while because the owner didnt report it straight away. Shame, not a bad phone!

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Unlock samsung sgh u600


check it

This will also bring the phone to default settings
1. First do a CUSTOM reset: *2767*2878# (star 2767 star 2878 hash)
turn off the phone
2. take out the battery and sim and put wrong network SIM and insert a half of it,
so it won't ask for network password and shows "Insert SIM" message.
Now put the battery ,and switch the phone on .(phone shows "Insert SIM" message.)
3.With out turning off the phone push the sim fully in. At this stage the phone is still asking to "Insert SIM"
4. Make a FULL reset by typing: *2767*3855#(star 2767 star 3855 hash)
5. The phone should reboot working with "wrong" sim inside.
6. Make a Change the NCK password to 8 zeros by typing: *7465625*638*00000000*00000000#
(star 7465625 star 638 star 8zeros star 8zeros hash)
7. Now Disable network lock By typing: #7465625*638*00000000#
(hash 7465625 star 638 star 8zeros hash)
Phone is unlocked (check with *#7465625#)


Apr 18, 2009 | Samsung SGH-U600 Cellular Phone

1 Answer

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i have a samsung sgh G600 and it from uk and i live in India and when i put my indian sim it asks for network lock

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you need to go to your network settings n change the band

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