Telephone

If you're worried about individuals eavesdropping on you, never use a land-line phone, they are very easy to tap, especially if you live in an apartment building. A cellular phone on a digital system is actually more difficult to tap.
If you're worried about the government eavesdropping, never use your own phone, cellular or land-line. Always make calls on pay phones or, better yet, don't use phones at all. Remember, the recipient of your call is probably being tapped, or recording the conversation themselves.
If you must use pay phones, spray them with a disinfectant before using them and place a cloth or towel between your mouth and the mouthpiece as well as your ear and the earpiece.
Don't have an answering machine. Anyone who breaks into your house can easily check it.
If you must have an answering machine, disable the remote access feature, so people cannot check your message remotely.
Remember, many phones record all keys typed into it. Checking voicemail from a phone you don't control can be a recipe for disaster, letting others know your password.