Sony Ericsson T61LX manual Reset Settings

Priority
You can change the order of the system types for which
your phone searches. Your default Priority is
(1) Residential, (2) Private, and (3) Public. This means
that your phone will look for service on a Public system
first, followed by a Private system, followed by a			e
Residential system.
Reset Settings			s
			U
You can reset all of your phone settings to the factory		a
		i	l
defaults.
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Note! You must enter your phonelock code to reset all	r
	e
of your phone’s settings to the factory defaults.	m
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Settings Menu 37