I found this article in the web. I followed the instruction and could do it as he said, with out problem.
-There is an easy way to do what he wanted, just change your setting to airplane mode and the machine won't broadcast anything.
-You are at your own risk. There is not warranty implicit about the procedure. If you break the machine, is your problem. If you got any doubts, better don't touch it.
-The article reflex his opinion, not mine.
A Torx T-10 screwdriver.
A plastic scribe(s) for prying the case apart. A credit card or other piece of thin, rigid plastic might substitute. If you are willing to risk causing some damage to the case, a flathead screwdriver could be used instead.
Start by unplugging the Airsense 10 and removing the water tank and hose.
Remove the shiny black front bezel by grasping it at the top and gently prying it off. Fingernails should be sufficient.
Remove the two exposed T-10 screws on the front of the Airsense 10.
On the bottom of the Airsense 10, there are eight screws. Remove only the two screws at the very back of the CPAP, about 3/4" up the side.
On the lower front of the machine gently pry the upper housing FORWARD - there are several clips that run horizontally back into the machine.
On the lower back of the CPAP gently pry the upper housing up and out. Take your time.
Remove the upper housing from the machine.
On the circuit board on the front of the machine, find the SD card cage on the left. Just below it, find a small black connector labelled J302 with four white wires running to it. You want to disconnect this gently. I suggest putting something smooth and flat under ALL of the wires and gently lifting up. It should disconnected very easily with almost no force.
You're almost done.
I suggesting testing the machine before reassembling it. Plug it in, make sure it runs. Under the "Options" menu, select "About". You should see blanks in the modem fields.
Put the top cover back on. Proceed gently. You will need to press in on the front edge. Reinstall two screws in the front and two on the bottom. Replace the front bezel.
P.S. to anyone from ResMed reading this: some of us do not consent to having our sleep data shared with you. I was very tempted to have my DME supplier swap out this ResMed device for another vendor's CPAP. I suggest that your future machines have an easy option to disable the modem and leave it disabled. Perhaps the modem could be an easily-removable add-on, as with the S9. Or perhaps you could have a hardware disable switch hidden inside one of the side panels.
(I will try to post pictures later.)