<s>
The	O
Nokia	B-Operating_System
N91	I-Operating_System
is	O
a	O
smartphone	B-Application
produced	O
by	O
Nokia	O
as	O
part	O
of	O
their	O
Nseries	B-Language
line	O
of	O
portable	O
devices	O
.	O
</s>
<s>
It	O
was	O
announced	O
on	O
April	O
27	O
,	O
2005	O
along	O
with	O
N70	B-Language
and	O
N90	B-Language
as	O
the	O
first	O
three	O
Nseries	B-Language
devices	O
.	O
</s>
<s>
The	O
N91	O
ran	O
on	O
Symbian-based	O
S60	B-Language
3rd	O
Edition	O
(	O
the	O
first	O
to	O
run	O
on	O
Symbian	B-Operating_System
9.1	O
)	O
.	O
</s>
<s>
with	O
dedicated	O
music	O
keys	O
on	O
the	O
front	O
which	O
slide	O
down	O
to	O
reveal	O
the	O
keypad	B-Device
.	O
</s>
<s>
It	O
also	O
featured	O
the	O
industry-standard	O
3.5mm	O
headphone	O
jack	O
,	O
and	O
was	O
anticipated	O
as	O
a	O
major	O
challenger	O
to	O
Apple	O
,	O
whose	O
iPod	B-Device
dominated	O
the	O
industry	O
.	O
</s>
<s>
Nevertheless	O
,	O
N91	O
won	O
the	O
'	O
Most	O
Innovative	O
Product	O
 '	O
and	O
'	O
Most	O
Technologically	O
Advanced	O
Product	O
 '	O
award	O
in	O
recognition	O
of	O
its	O
true	O
multimedia	O
music	O
experience	O
,	O
added	O
together	O
with	O
its	O
high-end	O
smartphone	B-Application
capabilities	O
.	O
</s>
<s>
It	O
features	O
a	O
2-megapixel	O
camera	O
and	O
a	O
music	O
player	O
playing	O
songs	O
encoded	O
in	O
either	O
AAC	B-Application
,	O
AAC+	O
,	O
eAAC+	O
,	O
MP3	B-Application
,	O
mp3PRO	B-Algorithm
,	O
WAV	O
,	O
MIDI	O
,	O
or	O
Microsoft	O
's	O
WMA	B-Application
format	O
.	O
</s>
<s>
It	O
also	O
features	O
3G	B-Architecture
and	O
Wi-Fi	O
connectivity	O
.	O
</s>
<s>
The	O
phone	O
features	O
a	O
176	O
x	O
208	O
,	O
262,144	O
colours	O
TFT	B-Device
LCD	I-Device
display	O
and	O
dedicated	O
music	O
functionality	O
buttons	O
(	O
XpressMusic	O
)	O
that	O
slide	O
down	O
to	O
reveal	O
traditional	O
mobile	O
phone	O
keys	O
.	O
</s>
<s>
The	O
N91	O
was	O
not	O
the	O
first	O
smartphone	B-Application
with	O
a	O
gigabyte	O
hard	O
drive	O
:	O
the	O
Samsung	O
SGH-i300	O
,	O
announced	O
just	O
a	O
month	O
before	O
the	O
N91	O
,	O
was	O
the	O
first	O
.	O
</s>
<s>
N91-5	O
was	O
a	O
version	O
of	O
the	O
N91	O
with	O
the	O
4GB	O
memory	O
,	O
but	O
without	O
Wi-Fi	O
(	O
WLAN	O
)	O
and	O
3G	B-Architecture
Network	I-Architecture
support	O
.	O
</s>
<s>
There	O
have	O
been	O
a	O
few	O
problems	O
with	O
the	O
N91	O
,	O
namely	O
connecting	O
the	O
phone	O
to	O
a	O
Macintosh	B-Device
computer	O
.	O
</s>
