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Cell Phone tip while hiking.

I was recently chatting with folks from the local Search & Rescue
team.
They recommend starting out your wilderness hikes with a full charge,
and then turning off cell phones as soon as you reach the trailhead or
leave the service area.
Why?
While you are in a digital service area, your phone uses very little
battery power staying in contact with the network. As soon as you go
out of range, you phone is still trying frantically to establish
contact with the network, probably  in analog mode. This uses
substantially more battery power than when it's in a digital service
area.
They advise to turn off the phones, and in case of an emergency, THEN
turn it back on and try to call for help. You will have a relatively
full battery charge.
Another tip. Even if you have unusable service, try texting all the
details of your emergency situation to a friend, and have then call
S&R out for you. Sometimes a text (burst) transmission has a better
chance of getting through.

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