Nokia 7160 - Manual (Page 117)

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Q. How do I find out how many memory locations the phone has?
A. Press Names and scroll to Options.
Press Select.
Scroll to Memory status and press Select again. A message appears
that says Phone: xx free, xx in use where xx indicates the percent of
memory used.
For more information, refer to “Memory status” on page 49 and
“Technical information” on page 121.
Q. How do I find my phone’s ESN (electronic serial number)?
A. Turn your phone off, then remove the battery from the back of the
phone. Your phone’s ESN number is printed on the sticker that is on
the rear cover, and is labeled, "ESN."
Q. How can I change the contrast of my phone’s display?
A. Press Menu 4-3-5 and press Select. Use the roller to adjust the
contrast, then press OK (or the roller).
For more information, refer to “Display contrast” on page 53.
Q. How do I clear my call timers?
A. WARNING: The clearing of call timers cannot be undone.
Press Menu 2-5-4 and press OK. Enter your security code and
press OK.
Refer to “Clear call timers” on page 31 for more information.