<s>
A	O
personal	B-Application
safety	I-Application
app	I-Application
or	O
SOS	B-Application
app	I-Application
is	O
a	O
mobile	B-Application
application	I-Application
which	O
can	O
be	O
used	O
to	O
aid	O
personal	O
safety	O
.	O
</s>
<s>
While	O
most	O
personal	B-Application
safety	I-Application
apps	I-Application
are	O
offered	O
as	O
freeware	B-License
,	O
some	O
are	O
either	O
distributed	O
as	O
a	O
freemium	O
app	O
with	O
paid	O
features	O
which	O
can	O
be	O
unlocked	O
through	O
in-app	O
purchases	O
,	O
supported	O
through	O
advertising	O
,	O
or	O
marketed	O
as	O
paid	O
applications	O
.	O
</s>
<s>
These	O
include	O
various	O
features	O
,	O
including	O
sending	O
text	O
messages	O
,	O
e-mails	O
,	O
IMs	B-Application
,	O
or	O
even	O
Tweets	B-Application
to	O
close	O
friends	O
(	O
containing	O
approximate	O
location	O
,	O
)	O
or	O
emitting	O
a	O
loud	O
intermittent	O
"	O
shrill	O
whistle	O
"	O
in	O
the	O
manner	O
of	O
a	O
rape	O
alarm	O
.	O
</s>
<s>
She	O
suggested	O
that	O
developers	O
incorporate	O
functionality	O
which	O
does	O
n't	O
rely	O
on	O
the	O
internet	O
,	O
because	O
of	O
the	O
poor	O
3G	B-Architecture
connectivity	O
in	O
India	O
in	O
2012	O
.	O
</s>
