Communications

If you need to make a sensitive phone call that must not be directly associated with you, do so from a public phone box. But beware, if you are associated with the person at the other end of the call, and the content of their calls (rather than just the data) is being monitored, your location at that date and time will be discovered.
If using public phone boxes, try to use them randomly across an area rather than the ones that are closest to you. Also, try to avoid phone boxes on direct transport routes to your home or place of work.
If you wish to send something sensitive through the post, wear gloves to prevent creating fingerprints when producing/packing the item, do not lick the envelope or stamps to prevent creating a DNA sample, and post it in a different location to where you normally post your letters (the further the better) using stamps bought on a different day.
If you print something, use a printer that can not be traced back to you. With Printer steganography it may be possible to find out when, and where a document was printed.
If you need to send a sensitive fax, use a copy shop/bureau which has a self-service desk.
If you desperately need to keep in communication, buy a pay-as-you-go mobile phone and only use it for a day or two whilst you are engaged in sensitive work.

Cable Scrambler
Laser Microphone