Is there a Software which I can use my PC like a regular Phone?

Hi

and yes there is a couple of software out there that can do that one being Skype.

i am not sure about using your landline, but AIM talk line is pretty neat, I use it. It's $10 a month for unlimited long distance. You do need to use a gaming headset (pretty cheap if you look around) If you need it for your friends and family to call you instead of your cell phone, you can use the talk line for incoming calls only for free.

u maybe meaning Skype www.skype.com here u can also use it to make calls to other phones.

ymessenger latest version which can be downloaded free is also another fine stuff, here u need only a headphone and mic and u can talk unlimited free to u'r contacts, when they are online and has ymessenger installed.

Then if u r in London, they suport another gadget, which need u to switch on only u'r modem for making call, that is also a paid service.

Internet Call Waiting, Online Caller ID, Modem-on-Hold and FREE Caller ID Software! Shows and speaks callers name and number, no ads and no spyware.

http://www.filesforfree.com/phonetray_dialup.htm

get yahoo messenger

www.yahoo.com/messenger

all you need is

^internet connection

^friends with a yahoo account and messenger

^a yahoo accounts

the calls are free