i use this.

http://www.vtechphones.com/vtechphon...ProductID=1458

works fine and connects to my phone, and my wifes phone pretty simple. can decide to make calls using the landline and the cellphone. it does not sync all my contacts from the n900...thank god, i have over 1100! but works just like using your n900 by making the call via the cellular through the landline handset.

if you live in a small home or appartment, it should be fine. our house is a bit larger so it only connects autmatically when i am in my office. as it is bluetooth, about 30feet from the device is where the n900 should be.