27
b.
Press
PIN
Enter
PIN
numbers
to
unlock
the
screen.
c.
Press
password
Set
password
to
unlock
the
screen.
d.
Press
“none”
Stop
this
application.
2)
Set
up
SIM
card
lock
Enter
（
4
‐
8numbers
）
PIN
to
set
the
lock
of
SIM.
SIM
card
PIN
(Personal
Identification
Number)
is
to
prevent
unauthorized
use
of
SIM
cards.PIN
code
provided
with
SIM.
The
service
provider
gives
the
initial
value.
Change
a
blocked
PIN
code,
you
need
to
open
the
"SIM
Lock
",
then
go
to
Change
Password
screen,
the
phone
will
automatically
prompt
enter
the
old
PIN
code
and
asked
to
enter
a
new
PIN
code
twice,finally
the
phone
will
prompt
that
change
the
code
successfully.
If
you
enter
the
PIN
with
error
for
three
times,
SIM
card
PIN
codes
will
be
automatically
locked,
PUK
codes
is
usually
supplied
with
SIM
card.
If
no,
you
should
go
to
the
service
provider
for
the
codes.
If
you
enter
10
times
wrong
PUK
code,
the
SIM
card
will
be
permanently
locked.
3)
Visible
password
Visible
password
when
enter
it
4)
Select
device
administration
Add
or
delete
device
manager.
5)
Use
security
credentials
Allow
application
visit
security
credentials
or
other
credentials.
6)
Install
from
SD
card
Install
the
