<s>
Mobile	B-Application
Dialer	I-Application
is	O
a	O
software	B-Application
application	I-Application
installed	O
and	O
used	O
on	O
mobile	O
phones	O
.	O
</s>
<s>
Various	O
software	O
providers	O
offer	O
branded	O
mobile	B-Application
dialers	I-Application
.	O
</s>
<s>
They	O
are	O
used	O
to	O
make	O
VoIP	B-Application
(	O
Voice	B-Application
over	I-Application
Internet	I-Application
Protocol	I-Application
)	O
calls	O
from	O
a	O
mobile	O
hand	O
set	O
.	O
</s>
<s>
The	O
"	O
Mobile	B-Application
Dialer	I-Application
"	O
or	O
"	O
Mobile	O
VoIP	B-Application
Dialer	O
"	O
uses	O
SIP	B-Application
signaling	O
and	O
can	O
be	O
mapped	O
to	O
a	O
Softswitch	B-Device
or	O
an	O
IP	O
device	O
to	O
work	O
a	O
device	O
for	O
voice	O
communication	O
.	O
</s>
<s>
Newer	O
mobile	B-Application
dialers	I-Application
also	O
allow	O
users	O
to	O
originate	O
a	O
Voice	O
Call	O
or	O
SMS	O
using	O
their	O
mobile	O
handset	O
.	O
</s>
<s>
In	O
many	O
countries	O
,	O
VoIP	B-Application
is	O
considered	O
as	O
"	O
illegal	O
Business	O
"	O
and	O
is	O
banned	O
by	O
the	O
government	O
.	O
</s>
<s>
Mobile	B-Application
Dialer	I-Application
application	O
can	O
run	O
behind	O
network	B-Protocol
address	I-Protocol
translation	I-Protocol
(	O
NAT	O
)	O
and	O
on	O
private	O
IP	O
and	O
can	O
pass	O
through	O
firewalls	O
or	O
blocked	O
networks	O
when	O
combined	O
with	O
tunneling	B-Protocol
software	I-Protocol
.	O
</s>
<s>
Consumers	O
may	O
switch	O
to	O
VoIP	B-Application
as	O
it	O
offers	O
international	O
calling	O
at	O
affordable	O
rates	O
.	O
</s>
<s>
Mobile	B-Application
Dialer	I-Application
allows	O
users	O
to	O
use	O
VoIP	B-Application
or	O
Voice	B-Application
over	I-Application
Internet	I-Application
Protocol	I-Application
on	O
their	O
mobile	O
phones	O
with	O
great	O
ease	O
.	O
</s>
<s>
Mobile	B-Application
dialers	I-Application
remove	O
the	O
traditional	O
VoIP	B-Application
limitation	O
of	O
using	O
computer	O
or	O
other	O
VoIP	B-Application
devices	O
restricted	O
to	O
home	O
environment	O
.	O
</s>
<s>
New	O
generation	O
mobile	O
phone	O
users	O
have	O
access	O
to	O
varieties	O
of	O
internet	O
services	O
like	O
GPRS	B-General_Concept
,	O
3G	B-Architecture
and	O
Wi-Fi	O
connections	O
which	O
makes	O
it	O
easy	O
to	O
make	O
VoIP	B-Application
calls	I-Application
from	O
any	O
place	O
in	O
cheaper	O
rate	O
.	O
</s>
<s>
In	O
that	O
case	O
,	O
users	O
need	O
to	O
install	O
a	O
supportive	O
mobile	B-Application
dialer	I-Application
into	O
their	O
handset	O
.	O
</s>
