<s>
Airplane	B-Device
mode	I-Device
(	O
also	O
known	O
as	O
aeroplane	B-Device
mode	I-Device
,	O
flight	B-Device
mode	I-Device
,	O
offline	B-Device
mode	I-Device
,	O
or	O
standalone	O
mode	O
)	O
is	O
a	O
setting	O
available	O
on	O
smartphones	B-Application
and	O
other	O
portable	O
devices	O
.	O
</s>
<s>
When	O
activated	O
,	O
this	O
mode	O
suspends	O
the	O
device	O
's	O
radio-frequency	O
(	O
RF	O
)	O
signal	O
transmission	O
technologies	O
(	O
i.e.	O
,	O
Bluetooth	B-Protocol
,	O
telephony	O
and	O
Wi-Fi	O
)	O
,	O
effectively	O
disabling	O
all	O
analog	O
voice	O
,	O
and	O
digital	O
data	O
services	O
,	O
when	O
implemented	O
correctly	O
by	O
the	O
electronic	O
device	O
software	O
author	O
.	O
</s>
<s>
Typically	O
,	O
it	O
is	O
not	O
possible	O
to	O
make	O
phone	O
calls	O
or	O
send	O
messages	O
in	O
airplane	B-Device
mode	I-Device
,	O
but	O
some	O
smartphones	B-Application
allow	O
calls	O
to	O
emergency	O
services	O
.	O
</s>
<s>
Most	O
devices	O
allow	O
continued	O
use	O
of	O
email	B-Protocol
clients	I-Protocol
and	O
other	O
mobile	B-Application
apps	I-Application
to	O
write	O
text	O
or	O
email	O
messages	O
.	O
</s>
<s>
Messages	O
are	O
stored	O
in	O
memory	O
to	O
transmit	O
later	O
,	O
once	O
airplane	B-Device
mode	I-Device
is	O
disabled	O
.	O
</s>
<s>
Wi-Fi	O
and	O
Bluetooth	B-Protocol
can	O
be	O
enabled	O
separately	O
while	O
the	O
device	O
is	O
in	O
a	O
pseudo-airplane	O
mode	O
,	O
as	O
allowed	O
by	O
the	O
operator	O
of	O
the	O
aircraft	O
.	O
</s>
<s>
Receiving	O
RF	O
signals	O
(	O
as	O
by	O
radio	O
receivers	O
and	O
satellite	O
navigation	O
services	O
)	O
may	O
not	O
be	O
inhibited	O
by	O
airplane	B-Device
mode	I-Device
;	O
however	O
,	O
both	O
transmitters	O
and	O
receivers	O
are	O
needed	O
to	O
receive	O
calls	O
and	O
messages	O
,	O
even	O
when	O
not	O
responding	O
to	O
them	O
.	O
</s>
<s>
Since	O
a	O
device	O
's	O
transmitters	O
are	O
shut	O
down	O
when	O
in	O
airplane	B-Device
mode	I-Device
,	O
the	O
mode	O
reduces	O
power	O
consumption	O
and	O
increases	O
battery	O
life	O
.	O
</s>
<s>
China	O
:	O
Prior	O
to	O
September	O
2017	O
,	O
cell	O
phones	O
,	O
even	O
with	O
airplane	B-Device
mode	I-Device
,	O
were	O
never	O
allowed	O
to	O
be	O
used	O
during	O
the	O
flight	O
although	O
other	O
devices	O
can	O
be	O
used	O
while	O
in	O
cruising	O
altitude	O
.	O
</s>
<s>
On	O
September	O
18	O
,	O
2017	O
,	O
the	O
Civil	O
Aviation	O
Authority	O
of	O
China	O
relaxed	O
these	O
rules	O
and	O
allowed	O
all	O
Chinese	O
air	O
carriers	O
to	O
allow	O
the	O
use	O
of	O
Portable	O
Electronic	O
Devices	O
(	O
PEDs	O
)	O
for	O
the	O
entire	O
flight	O
as	O
long	O
as	O
they	O
are	O
in	O
Aeroplane	B-Device
Mode	I-Device
.	O
</s>
<s>
United	O
States	O
:	O
In	O
a	O
revised	O
review	O
in	O
October	O
2013	O
,	O
the	O
United	O
States	O
Federal	O
Aviation	O
Administration	O
(	O
FAA	O
)	O
made	O
a	O
recommendation	O
on	O
the	O
use	O
of	O
electronic	O
devices	O
in	O
"	O
airplane	B-Device
mode	I-Device
"	O
—	O
cellular	O
telephony	O
must	O
be	O
disabled	O
,	O
while	O
Wi-Fi	O
may	O
be	O
used	O
if	O
the	O
carrier	O
offers	O
it	O
.	O
</s>
<s>
Short-range	O
transmission	O
such	O
as	O
Bluetooth	B-Protocol
is	O
permissible	O
on	O
aircraft	O
that	O
can	O
tolerate	O
it	O
.	O
</s>
