<s>
Android	B-Application
1.6	I-Application
Donut	B-Application
is	O
the	O
fourth	O
version	O
of	O
the	O
open	O
source	O
Android	B-Application
mobile	I-Application
operating	I-Application
system	I-Application
developed	O
by	O
Google	B-Application
.	I-Application
</s>
<s>
Among	O
the	O
more	O
prominent	O
features	O
introduced	O
with	O
this	O
update	O
were	O
added	O
support	O
for	O
CDMA	B-Protocol
smartphones	B-Application
,	O
additional	O
screen	O
sizes	O
,	O
a	O
battery	O
usage	O
indicator	O
,	O
and	O
a	O
text-to-speech	B-Application
engine	I-Application
.	O
</s>
<s>
After	O
the	O
public	O
release	O
of	O
Donut	B-Application
—	O
its	O
official	O
dessert-themed	O
code	O
name	O
,	O
the	O
convention	O
employed	O
by	O
Google	B-Application
to	O
designate	O
major	O
Android	B-Application
versions	I-Application
—	O
carriers	O
were	O
quick	O
to	O
follow	O
with	O
its	O
roll	O
out	O
to	O
customers	O
in	O
the	O
form	O
of	O
an	O
over-the-air	O
(	O
OTA	O
)	O
update	O
for	O
compatible	O
smartphones	B-Application
.	O
</s>
<s>
On	O
September	O
27	O
,	O
2021	O
,	O
Google	B-Application
announced	O
it	O
would	O
no	O
longer	O
allow	O
signing	O
in	O
on	O
Android	B-Application
devices	O
that	O
run	O
Android	B-Application
2.3.7	I-Application
Gingerbread	B-Application
or	O
older	O
,	O
requiring	O
Android	B-Application
3.0	I-Application
(	O
on	O
tablets	O
)	O
or	O
4.0	B-Application
(	O
phone	O
and	O
tablets	O
)	O
or	O
higher	O
to	O
log	O
in	O
.	O
</s>
<s>
New	O
features	O
introduced	O
by	O
Donut	B-Application
include	O
the	O
following	O
:	O
</s>
<s>
Multi-lingual	O
speech	B-Application
synthesis	I-Application
engine	O
to	O
allow	O
any	O
Android	B-Application
application	I-Application
to	O
"	O
speak	O
"	O
a	O
string	O
of	O
text	O
.	O
</s>
<s>
Easier	O
searching	O
and	O
the	O
ability	O
to	O
view	O
app	O
screenshots	O
in	O
Android	B-Application
Market	O
.	O
</s>
<s>
Updated	O
technology	O
support	O
for	O
CDMA/EVDO	O
,	O
802.1x	O
,	O
VPNs	B-Application
,	O
and	O
a	O
text-to-speech	B-Application
engine	I-Application
.	O
</s>
