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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
mobile unlock..it is very simple now a days..there are so many ways to unlock..last month i found a site here mobile unlock can be done..further http://www.mobileunlockguide.com/
in most cases the fibre ribbon gets worn out.
you can try a local cellphone repair shop, or sony service if you can afford it.
the ribbon needs to be replaced.
I have Z550i by mistake it droped in water for 10 minutes. I make it ON after soaking for 4 -5 hours. Now it is goiving humming sound only when we recieve calls (during active network link with other person) from other side or when we dial someone. In simple on condition there is no humming sound. Also it is discharging soon. MP3 songs and radio is working fine. When I put it in charging it shows that your USB port is active and reday to data transfer. I am unable to understand what is the problem.
what is procedure to keypad lock
Anybody suggest how to move messages to memory card in Sony Ericsson Z550i?
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