The Dect 6.0 cordless phones are supposed to be Interference free. My neighbors 5.8 GHz phone shuts my SM down instantly so I just picked up this phone from the local WalMart. http://www.walmart.com/catalog/product. … id=5230831
There are cheaper phones as well.
So far it hasn’t shut down the router like the 2.4 GHz did, and hasn’t bothered the SM either.