Yes you can.
I assume you try to use the phone jacks inside your house for 两个以上的电话
. In this case, you'd better to disconnect the house external connection for
the phone wiring from the wireline phone company(like AT&T and Verizon etc)
. Typically it's inside the gray phone box on side of your house external
wall. Only do
this after you cancel the regular wireline phone service (like AT&T and
Verizon etc).
