Lock on changing SIM - Nexus S General

Hi, I am looking for some help with my Nexus S.
I recently rebooted and changed to a new SIM, and upon booting I am presented with a screen saying "Enter password to unlock", My gmail password wont work and I don't know what password it means.
So i then put my old SIM back, and it still happens! now I cant get into my phone at all, and cant use it!
I even tried a reset, and when I select recovery in the bootloader, it doesn't work.
I do have Prey installed (http://preyproject.com/), and I did forget to switch it off before changing SIMs, but I entered my prey password and that didn't work either.
Please help!
Thanks in advance,
Tris

Ok i have solved this.
It was Prey that had locked my phone, and I had got the password wrong!
At least it shows it will make it really difficult for anyone who steals my phone!!

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[Q] Can't use pattern lock, swipe lock & pin in my S3 Neo i9301i?

I bought a Samsung Galaxy S3 Neo i9301i from Italy without any service offer. But i use it in Bangladesh. When i tried to use that phone here it say's to give a pin code for network lock. I went to nearest local service center and they unlock the phone in some way but i can't use my Swipe, Pattern lock . I can only use password. It is very painful giving password every time. Here is a screenshot of my lock screen. Can anyone help me about this matter?
Hmm seems that your device is encrypted.. dont know why it disabled features for you.. i suggest wiping data/ factory reset over recovery mode ( vol up + home + power ) to see if it will help. Note that this will remove everythign from your phone so backup important data
Maybe because in Italy is Locked,but i don't think that has to do...
Horrible english but i'm italian
sulaimansust said:
I bought a Samsung Galaxy S3 Neo i9301i from Italy without any service offer. But i use it in Bangladesh. When i tried to use that phone here it say's to give a pin code for network lock. I went to nearest local service center and they unlock the phone in some way but i can't use my Swipe, Pattern lock . I can only use password. It is very painful giving password every time. Here is a screenshot of my lock screen. Can anyone help me about this matter?
Click to expand...
Click to collapse
Go to LOCK SCREEN and change to swipe or what ever you whant? Than write the password you already have signed and done. I make the same and its working for me.
(sorry for my english)
Scarfangs said:
Go to LOCK SCREEN and change to swipe or what ever you whant? Than write the password you already have signed and done. I make the same and its working for me.
(sorry for my english)
Click to expand...
Click to collapse
I have already tried that too. It say's Pattern lock, swipe and other's lock system are disabled by administrators, credential manage or encryption policy. Please see my uploaded image
sulaimansust said:
I have already tried that too. It say's Pattern lock, swipe and other's lock system are disabled by administrators, credential manage or encryption policy. Please see my uploaded image
Click to expand...
Click to collapse
But from where you enter there from Security or Lockscreen?
Rox said:
Hmm seems that your device is encrypted.. dont know why it disabled features for you.. i suggest wiping data/ factory reset over recovery mode ( vol up + home + power ) to see if it will help. Note that this will remove everythign from your phone so backup important data
Click to expand...
Click to collapse
Thanks for your reply. Yes, I had encrypted my phone. Do you know anything about if i do factory reset/wiping data, will it show again a network lock? If it become network lock again it will cost me about 20$
sulaimansust said:
Thanks for your reply. Yes, I had encrypted my phone. Do you know anything about if i do factory reset/wiping data, will it show again a network lock? If it become network lock again it will cost me about 20$
Click to expand...
Click to collapse
I encrypt my phone 2 h ago and now is normal.
Scarfangs said:
But from where you enter there from Security or Lockscreen?
Click to expand...
Click to collapse
From lock screen . these are the image when i enter to lock screen. First image is when i try to enter in lock screen[it want password] . And second one is when i have entered there
sulaimansust said:
From lock screen . these are the image when i enter to lock screen. First image is when i try to enter in lock screen[it want password] . And second one is when i have entered there
Click to expand...
Click to collapse
Strange i just encrypt but when i go to lock screen i enter the password and now i normal i dont know what will happen after charge or reboot.
And dont be nervous i try to help your choice did you will accept.
(sorry for mistakes and for my english)
Well, if factory reset does not solve your problem, the alternative that I can think of is to use ODIN to flash stock firmware.
Thanks all for reply. I just solved the problem. It was happening for encrypting my device. After decrypting my device the problem is solved

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