Skype's a much more universal VoIP program, and can call landline telephones as well, I believe. (Dunno about cells)
Voice Communication though, whatever the sort, can be helpful (Your hands have better things to do) but not strictly necessary. I've gotten pretty good about describing what to do for the STFs
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The Master said: "It is all in vain! I have never yet seen a man who can perceive his own faults and bring the charge home against himself."
>Analects: Book V, Chaper XXVI
Voice Communication though, whatever the sort, can be helpful (Your hands have better things to do) but not strictly necessary. I've gotten pretty good about describing what to do for the STFs
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The Master said: "It is all in vain! I have never yet seen a man who can perceive his own faults and bring the charge home against himself."
>Analects: Book V, Chaper XXVI