1.Tap Dialler and enter *#7370#
2.Tap Yes to restore all original phone settings
3.Enter the lock code (0000 by default) and tap OK
4.The phone restarts
i too have sony ericsson ST17i which works fine without sim but when a sim is inserted and switched on, it gets switched off by itself and later the routine of switch on and off till the battery is removed. i have factory reseted it several times. but its not working. But as stated earlier without sim it is working fine.
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Sony st21i2 sequrity mother maiden name
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