<s>
NumberSync	B-Application
is	O
an	O
AT&T	O
service	O
that	O
allows	O
some	O
postpaid	O
wireless	O
customers	O
to	O
use	O
one	O
telephone	O
number	O
to	O
send	O
and	O
receive	O
calls	O
and	O
text	O
messages	O
across	O
all	O
of	O
their	O
supported	O
devices	O
,	O
including	O
smartwatches	B-Application
.	O
</s>
<s>
,	O
activating	O
NumberSync	B-Application
requires	O
the	O
following	O
:	O
</s>
<s>
An	O
iPhone	B-Device
6	O
,	O
6	O
Plus	O
,	O
or	O
newer	O
model	O
,	O
</s>
<s>
A	O
recent	O
Mac	O
running	O
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
or	O
higher	O
.	O
</s>
<s>
The	O
iPhone	B-Device
has	O
supported	O
the	O
service	O
since	O
November	O
2015	O
.	O
</s>
<s>
FirstNet	O
subscribers	O
on	O
the	O
First	O
Net	O
Core	O
do	O
not	O
yet	O
have	O
NumberSync	B-Application
capabilities	O
.	O
</s>
