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I play BF2 while on the telephone with my friend.
I don't know if BF2 has a similar feature-set, but doing this in Counter-strike is cheating. Because when one of you dies, that player can spot for you in spectator mode if they're on the phone with you. The built-in voice features of Counter-strike prevent the living players from hearing the dead players' conversations so that this doesn't happen.
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The tactical advantage of voice communications is enormous, though.
Oh, I agree. I love playing in a game where that feature is used well by all the participants. I just find that it's so rare online that I just stopped looking for it.
I particularly like doing team-based games at LAN parties, so you can communicate with your teammates.