lately skype started providing poor call quality, besides the app is heavy, there are always some troubles with it… i suffer from them personally
there is another option… there’re many services that handle your call, from origination to termination. All you need to do is to dial your recipient number. With the country code. They are similar to skype, but cheper and more hi-quality
so you may check rebtel, keku, callnspeak, cheapcalls and others.