<s>
CalyxOS	B-Operating_System
is	O
an	O
operating	B-General_Concept
system	I-General_Concept
for	O
smartphones	B-Application
based	O
on	O
Android	B-Application
with	O
mostly	O
free	B-License
and	I-License
open-source	I-License
software	I-License
.	O
</s>
<s>
CalyxOS	B-Operating_System
preserves	O
the	O
Android	B-Application
security	O
model	O
,	O
using	O
Android	B-Application
's	O
Verified	O
Boot	O
system	O
of	O
cryptographic	O
signing	O
of	O
the	O
operating	B-General_Concept
system	I-General_Concept
,	O
and	O
running	O
with	O
a	O
locked	O
bootloader	B-Application
,	O
partly	O
thanks	O
to	O
an	O
installer	O
that	O
guides	O
the	O
user	O
through	O
the	O
process	O
of	O
unlocking	O
and	O
then	O
re-locking	O
the	O
bootloader	B-Application
.	O
</s>
<s>
The	O
Calyx	O
Institute	O
annual	O
reports	O
state	O
CalyxOS	B-Operating_System
was	O
publicly	O
launched	O
during	O
their	O
2018-2019	O
fiscal	O
year	O
.	O
</s>
<s>
Inspiration	O
included	O
Tails	B-Application
and	O
Qubes	O
OS	O
,	O
and	O
goals	O
were	O
said	O
to	O
be	O
"	O
completely	O
open	B-Application
source	I-Application
"	O
,	O
removing	O
proprietary	B-Application
Google	O
tracking	O
,	O
and	O
including	O
apps	O
Tor	O
,	O
Signal	B-Application
and	O
CalyxVPN	O
for	O
increased	O
privacy	O
.	O
</s>
<s>
CalyxOS	B-Operating_System
supports	O
Pixel	B-Device
phones	I-Device
Pixel	O
3	O
and	O
newer	O
.	O
</s>
<s>
In	O
April	O
2022	O
,	O
CalyxOS	B-Operating_System
announced	O
Android	B-Application
12L	O
for	O
testing	O
on	O
Fairphone	B-Application
4	I-Application
,	O
and	O
OnePlus	B-Application
8T	I-Application
,	O
9	B-Application
,	I-Application
and	I-Application
9	I-Application
Pro	I-Application
.	O
</s>
<s>
However	O
,	O
in	O
May	O
2022	O
,	O
CalyxOS	B-Operating_System
announced	O
OnePlus	O
builds	O
were	O
pulled	O
because	O
of	O
a	O
bootloader	B-Application
"	O
relock	O
issue	O
"	O
.	O
</s>
<s>
As	O
of	O
July	O
2022	O
,	O
according	O
to	O
CalyxOS	B-Operating_System
the	O
OnePlus	O
relock	O
issue	O
had	O
not	O
been	O
resolved	O
.	O
</s>
<s>
CalyxOS	B-Operating_System
gives	O
Aurora	O
Store	O
special	O
privileges	O
so	O
that	O
app	O
updates	O
can	O
be	O
automatically	O
installed.ChromiumFOSS	O
web	O
browserBromite	O
fork	O
,	O
succeeded	O
DuckDuckGo	B-Application
mobile	O
browser	O
as	O
the	O
default	O
web	O
browser	O
in	O
June	O
2022.F-DroidRepository	O
of	O
FOSS	B-License
applications	O
for	O
the	O
Android	B-Application
platformCalyxOS	O
gives	O
F-Droid	B-Application
special	O
privileges	O
to	O
streamline	O
app	O
updates	O
,	O
installs	O
,	O
and	O
uninstalls.MicroGFOSS	O
implementation	O
of	O
proprietary	B-Application
Google	O
Play	O
ServicesSome	O
apps	O
dependent	O
on	O
Google	B-Application
Play	I-Application
Services	I-Application
may	O
not	O
work	O
with	O
MicroG	B-Application
,	O
use	O
of	O
MicroG	B-Application
is	O
optional.SeedvaultEncrypted	O
backup	O
and	O
restore	O
application	O
for	O
AndroidThe	O
Calyx	O
Institute	O
sponsored	O
development	O
of	O
SeedVault	O
and	O
an	O
annual	O
report	O
states	O
they	O
"	O
debuted	O
SeedVault	O
"	O
during	O
their	O
2019-2020	O
fiscal	O
year	O
.	O
</s>
<s>
SeedVault	O
is	O
also	O
used	O
by	O
LineageOS.SignalEncrypted	O
calling/messaging	O
appFree	O
,	O
privacy-focused	O
messaging	O
and	O
voice	O
talk	O
app	O
,	O
preinstalled	O
as	O
messaging	O
app	O
in	O
CalyxOS	B-Operating_System
.	O
</s>
<s>
CalyxOS	B-Operating_System
ships	O
with	O
MicroG	B-Application
as	O
an	O
open-source	B-Application
alternative	O
to	O
the	O
Google	B-Application
Mobile	I-Application
Services	I-Application
,	O
including	O
Mozilla	O
Location	O
Services	O
as	O
an	O
optional	O
replacement	O
to	O
the	O
location	O
services	O
provided	O
by	O
Google	O
,	O
but	O
gives	O
the	O
user	O
the	O
option	O
to	O
disable	O
microG	B-Application
and	O
its	O
location	O
services	O
.	O
</s>
<s>
CalyxOS	B-Operating_System
was	O
added	O
to	O
AlternativeTo	B-Application
in	O
June	O
2020	O
.	O
</s>
<s>
CalyxOS	B-Operating_System
F-Droid	B-Application
repositories	O
are	O
included	O
in	O
F-Droid	B-Application
'	O
s	O
"	O
Known	O
Repositories	O
"	O
list	O
.	O
</s>
<s>
Phones	O
with	O
CalyxOS	B-Operating_System
preinstalled	O
are	O
being	O
sold	O
.	O
</s>
<s>
GoFOSS.net	O
published	O
a	O
CalyxOS	B-Operating_System
review	O
and	O
installation	O
guide	O
.	O
</s>
<s>
In	O
October	O
2020	O
,	O
Moritz	O
Tremmel	O
reviewed	O
CalyxOS	B-Operating_System
.	O
</s>
<s>
A	O
month	O
later	O
,	O
Tremmel	O
explained	O
why	O
he	O
preferred	O
CalyxOS	B-Operating_System
over	O
LineageOS	B-Application
.	O
</s>
<s>
A	O
year	O
later	O
in	O
September	O
2021	O
,	O
Tremmel	O
further	O
explained	O
how	O
CalyxOS	B-Operating_System
was	O
different	O
from	O
other	O
ROMs	O
because	O
it	O
did	O
not	O
require	O
as	O
much	O
"	O
fiddling	O
"	O
.	O
</s>
<s>
Rahul	O
Nambiampurath	O
,	O
writing	O
for	O
MakeUseOf	O
in	O
March	O
2021	O
,	O
termed	O
CalyxOS	B-Operating_System
,	O
"	O
[	O
one	O
of	O
the ]	O
best	O
 [ Android ] 	O
ROMs	O
for	O
privacy	O
...	O
offers	O
the	O
perfect	O
middle	O
ground	O
between	O
convenience	O
and	O
privacy	O
"	O
.	O
</s>
<s>
In	O
August	O
2021	O
,	O
Android	B-Application
Authority	O
wrote	O
CalyxOS	B-Operating_System
"	O
puts	O
privacy	O
and	O
security	O
into	O
the	O
hands	O
of	O
everyday	O
users.	O
"	O
</s>
<s>
In	O
July	O
2021	O
in	O
the	O
wake	O
of	O
the	O
ANOM	O
sting	O
operation	O
publicity	O
,	O
the	O
ability	O
to	O
lock	O
the	O
bootloader	B-Application
"	O
after	O
flashing	O
a	O
security-hardened	O
custom	B-Application
ROM	I-Application
like	O
CalyxOS	B-Operating_System
"	O
was	O
highlighted	O
by	O
XDA	B-Application
Developers	I-Application
.	O
</s>
<s>
In	O
2022	O
,	O
the	O
book	O
c't	O
Sicher	O
ins	O
Netz	O
:	O
How	O
to	O
block	O
out	O
monitors	O
and	O
attackers	O
,	O
said	O
"	O
CalyxOS	B-Operating_System
is	O
one	O
of	O
the	O
youngest	O
custom	O
ROMs	O
,	O
it	O
will	O
only	O
celebrate	O
its	O
second	O
birthday	O
in	O
summer	O
2022	O
.	O
</s>
<s>
In	O
2023	O
,	O
CalyxOS	B-Operating_System
was	O
the	O
one	O
alternative	O
phone	O
operating	B-General_Concept
system	I-General_Concept
recommended	O
by	O
Carey	O
Parker	O
in	O
the	O
book	O
"	O
Firewalls	O
Do	O
n't	O
Stop	O
Dragons	O
"	O
.	O
</s>
<s>
In	O
a	O
review	O
in	O
February	O
2023	O
,	O
the	O
Kuketz	O
Security	O
blog	O
said	O
CalyxOS	B-Operating_System
"	O
offers	O
a	O
coherent	O
overall	O
package	O
that	O
should	O
give	O
users	O
who	O
want	O
to	O
(	O
strongly	O
)	O
reduce	O
their	O
dependency	O
on	O
Google	O
a	O
good	O
start	O
"	O
and	O
said	O
the	O
integrated	O
Datura	O
Firewall	O
works	O
well	O
.	O
</s>
