In the 7912, you can find

Mikhail Kalita · ‎04-20-2016

How can I find out uptime phone 7911? I mean the time when the phone was switched off.

Jaime Valencia · ‎04-20-2016

Don't think the phone would show this anywhere but in the phone logs.

HTH

java

if this helps, please rate

Alberto Parrilla · ‎04-20-2016

In the 7912, you can find them in

Settings, status, Network statistics. Elapsed time.