Are you looking for the security code to unlock the cell phone so you can use the phone with a different phone service provider/SIM card?Are you looking for the security code to unlock the cell phone so you can use the phone with a different phone service provider/SIM card?
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It may be due to network lock, you can unlock it and switch over to another network , you can get unlock codes here http://www.prounlocking.com/sony-ericsson-z550i/rs8wp9/ you need to specify the country and network provider
The problems i have with the Ericcsons are that they cards do not stay in very well. Is it on the top? Try pressing it down when you transfer or whatever and see if it works. If so then i suggest taping it down something similar.
Are you looking for the security code to unlock the cell phone so you can use the phone with a different phone service provider/SIM card?
Sim card is not connect
Sim card is connect
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