[asterisk-users] migration

[Thomas Perron]

My client wants to use my service that I will host.  It is an IVR application.
I have the solution worked out on the server side.
I will port his current POTS line phone number to a DID service where
I can control it via SIP.

Question relates to his current phones.  Forgive me as I am new.
Does he need his current phones?  How will they ring if I port the number?
Should I simply have him remove the phones and I can send the calls to
his cell phones?