<s>
forfone	B-Protocol
is	O
a	O
free	O
VoIP-application	O
which	O
enables	O
the	O
user	O
to	O
make	O
calls	O
,	O
send	O
and	O
share	O
text	B-Device
messages	I-Device
,	O
photos	O
&	O
the	O
user	O
’s	O
current	O
location	B-Application
.	O
</s>
<s>
The	O
App	B-Application
does	O
not	O
require	O
any	O
additional	O
registration	O
or	O
user	O
account	O
but	O
allows	O
direct	O
access	O
to	O
all	O
mobile	O
and	O
landline	O
networks	O
worldwide	O
through	O
Wi-Fi	O
,	O
LTE	O
,	O
3G	B-Architecture
or	O
UMTS	B-Protocol
.	O
</s>
<s>
100%	O
reachability	O
can	O
be	O
guaranteed	O
by	O
sending	O
push-notifications	B-General_Concept
.	O
</s>
<s>
To	O
answer	O
calls	O
or	O
receive	O
messages	O
,	O
the	O
App	B-Application
therefore	O
does	O
not	O
have	O
to	O
be	O
open	O
or	O
be	O
running	O
in	O
the	O
background	O
.	O
</s>
<s>
The	O
application	O
is	O
compatible	O
with	O
every	O
iPhone	B-Device
,	O
iPod	B-Device
Touch	I-Device
or	O
Android	B-Application
device	O
and	O
runs	O
on	O
iOS	B-Operating_System
4.0	I-Operating_System
or	O
higher	O
or	O
Android	B-Application
2.2	I-Application
or	O
higher	O
.	O
</s>
<s>
forfone	B-Protocol
is	O
a	O
VoIP	B-Application
and	O
messaging	O
App	B-Application
which	O
makes	O
internet	B-Application
telephony	I-Application
as	O
easy	O
and	O
intuitive	O
as	O
making	O
a	O
normal	O
phone	O
call	O
through	O
a	O
mobile	O
operator	O
.	O
</s>
<s>
The	O
researchers	O
were	O
not	O
only	O
able	O
to	O
take	O
over	O
the	O
account	O
,	O
but	O
also	O
send	O
free	O
text	B-Device
messages	I-Device
from	O
the	O
servers	B-Application
of	O
many	O
tested	O
applications	O
.	O
</s>
<s>
Only	O
at	O
forfone	B-Protocol
and	O
3	O
other	O
applications	O
,	O
it	O
was	O
not	O
possible	O
to	O
take	O
the	O
account	O
over	O
,	O
nor	O
were	O
they	O
able	O
to	O
send	O
or	O
receive	O
text	B-Device
messages	I-Device
of	O
the	O
users	O
.	O
</s>
