Several weeks ago, I read an article introducing VoipStunt, which can make phone calls without charge, but just the regular landlines. It’s lucky that Taiwan is in their list. So I registered an ID and tried to phone home. That’s really free, and the connection quality was acceptable. So, since then, when I needed to call any regular landline, I always used it.
But there’s a little weakness. I can feel a little delay, about 0.5-1 second. If the call is short and not very important, this can be ignored. On the contrary, I’ll choose Skype as the first priority.