13
7
Keys
(
1
)
Power
:
Lock
the
phone
.
Long
press
to
power
up
or
down
the
phone
.
(
2
)
Menu
:
Bring
up
a
list
of
options
.
(
3
)
Home
:
Returns
to the
Home
Screen
.
Long
press
to
see
a
list
of
last
accessed
apps
.
(
4
)
Back
:
Return
to
the
previous
screen
.
(
5
)
Volume
:
Context
-
sensitive
volume
regulation
.
(
6
)
SOS
:
Long
press
to
activate the
SOS
-
alert
(
7
)
PTT
:
Activate
the
Push
-
to
-
Talk function
