people still use land lines? wow, why? EVERYONE and their mother has a cell phone now. And no one uses land lines for internet, everything is cable, DSL, or better. I have not had a land line and have only used my cell phone for 4 years now...
Cable and DSL both use "landlines". Unless you're using EVDO or something for all your internet, you're using a landline.
DSL even goes further in that it uses a telephone land line. Now whether or not you have voice service on that landline is a different story.
Unless things have changed since 2003 (from what I learned in my journalism law class), wiretapping laws aren't nearly as strict for cell phones as they are for land lines. This is because you are broadcasting a signal, so someone can potentially "listen in" to your call. I am still very hesitant to do any phone calls that involve any of my personal information for this very reason. Plus it can get very pricey when you burn through all of your minutes.
Unless you're using a corded telephone, you're just as susceptible to "tapping". It's just as illegal to tap a cell phone conversation as it is a hard wired conversation.
Back in the olden days of analog cell phones, it was pretty trivial to listen to a conversation from a cell phone. These days, it's much more complicated with CDMA and GSM networks, though still possible.
Having personal information lost over the phone should be the very very least of your concerns these days. Nobody has the time for it, when you can get names, addresses, SSANs and CC#s over the internet for a dollar a pop.