You can use
SKYPE anywhere you have an internet connection, no matter the country, but I doubt you can use it (very well if at all) with a slow or dial-up internet connection.
I was corresponding with someone who had SKYPE on their PDA which had WiFi capabilities and he used it (the PDA) like a telephone while he was traveling around Spain, calling his friends/family in the USA (or wherever). That sounded like a very cool way to use SKYPE - so portable.
I'm IN Madrid and my parents in the United States AND my sister in Switzerland call me PC-to-PC through Skype as I've called them. We've also had 3-way conference calls with high audio/voice quality.
I use the PC-to-landline-phone SKYPEout (paid service but CHEAP!) often too. It seems this SKYPEout function works but the audio receiving properties are lower in quality than the PC-to-PC function.
PC-to-PC voice/audio quality is as clear as if that person was sitting in the room next to you - even better quality than phone if you ask me. There is an ever-so-slight delay in voice transmission. Only on a few occasions have I had to "hang up" and reconnect.
When in the USA, I called Spanish landlines several times (SO cheap!) and also to cellular phones (SO expensive!) using SKYPEout but when it's the only way to contact someone abroad it's great.
Saludos, MadridMan
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