<s>
The	O
Samsung	B-Application
Z1	I-Application
is	O
a	O
smartphone	B-Application
created	O
by	O
Samsung	B-Application
Electronics	O
.	O
</s>
<s>
It	O
was	O
the	O
first	O
phone	O
to	O
use	O
the	O
Tizen	B-Application
operating	O
system	O
.	O
</s>
<s>
The	O
phone	O
was	O
succeeded	O
by	O
the	O
Samsung	B-Application
Z3	I-Application
in	O
October	O
2015	O
.	O
</s>
<s>
The	O
Samsung	B-Application
Z1	I-Application
features	O
a	O
480×800	O
WVGA	O
PLS	B-Architecture
TFT	B-Device
4-inch	O
display	O
with	O
a	O
pixel	B-Algorithm
density	I-Algorithm
of	O
233	O
pixels-per-inch	O
.	O
</s>
<s>
It	O
has	O
a	O
1.2GHz	O
dual-core	O
ARM	B-Application
Cortex-A7	I-Application
processor	B-General_Concept
,	O
768	O
MB	O
RAM	B-Architecture
,	O
4	O
GB	O
of	O
storage	O
(	O
with	O
option	O
for	O
up	O
to	O
64	O
GB	O
of	O
additional	O
storage	O
via	O
microSDXC	O
card	O
)	O
and	O
a	O
1500	O
mAh	O
battery	O
.	O
</s>
<s>
The	O
Samsung	B-Application
Z1	I-Application
comes	O
with	O
Samsung	B-Application
's	O
own	O
mobile	O
operating	O
system	O
Tizen	B-Application
.	O
</s>
<s>
The	O
UI	O
was	O
specifically	O
designed	O
for	O
users	O
who	O
were	O
upgrading	O
from	O
feature	O
phones	O
to	O
smartphones	B-Application
.	O
</s>
<s>
By	O
June	O
2015	O
Samsung	B-Application
sold	O
1	O
million	O
units	O
.	O
</s>
