Not much, unfortunately

 

No one really knows the full capabilities of the ECHELON network. It has been in operation for a half century. ECHELON may be rapidly approaching obsolescence, unable to deal with newer fiber-optic and cellular technology.

However, it has evolved and adapted to new communications technology in the past, adding capabilities as needed to keep up with the pace of change. The only purpose of the NSA and its counterpart organizations in other countries is to develop the means to listen in on our enemies, no matter what means of communication they use. The diversity and rapid pace of change present in Europe and the United States make for an ideal testing ground for new methods of interception and analysis. Any new techniques or technologies developed will probably be deployed in the western world first, just to make sure they work.

If you want to maintain the high-tech lifestyle you are no doubt used to, there’s very little you can do to avoid the all-seeing eye of ECHELON.