The MAILING ADDRESS REMAINS THE SAME.
The PHONE NUMBER REMAINS THE SAME.
For a few weeks, Uncle will have to use a dial-up connection until the DSL can be moved so the line will be busy when he is on the computer. That ought to be about 3 weeks. Once the DSL is moved things will be back to normal and his phone will then once again remain open while the computer runs on the DSL.
The HI mailing address is a Private Mail Box ( PMB ) due apparently to the volume recieved and sent, as I understand it, and also due to it being within a few blocks rather than in the middle of downtown. So it will not change.