You can or used to go to radio shack and get a mic that sticks to your phone and record it. Some cassette recorders ecven came with them.
The days of all the clicks and sounds of you being recorded are mostly long gone.
COMSEC ( Communications Security) is huge concern with those that deal with such information.
ALL electronic communications are subject to monitoring and being recorded at any time. This includes telephone/cellphone/walkaround phones/faxes/radio/etc....
Ever heard of the NSA? The NSA has maintained a classified base and listening post, in Austrailia for many many years.
NEVER believe any electronic communications are 100% secure. Anyone ever heard of
"ECHELON"Do a search on it.
Ever heard of
"CARNIVORE" ? Carnivore has a new and polite and more friendly name now. Try this site
http://www.epic.org/privacy/carnivore/ for more info.
There are programs people could or you could put on your puter to monitor what they do with it, where they visit, who they write and what they say....etc....
For more information on electronic surveillance, check with
www.epic.org and your own state laws. There are many numerous laws out there, but they do not stop people from breaking them. People break speed limits for example do they? People break many laws either intentionally or unintentionally. Some are violent and some are not...
If you need the info for personal reasons and your files only and not to be used for anything else....perhaps you could do so....I could not tell you. It would be best to ask someone that would know in your state...a Private Detective or security consultant or a lawyer... ask several of them..... or even ask a judge or paralegals... You may find it is quite clear or it is a grey area.