Season 1 help

ok so as we all know, Jack gave Will Elouise Kurts pin transmitter and is the voice on the end of the phone with a voice box which we all find out later in the series,

so if this is true how was he talking to Will when he was with Sydney saving SD-6 from Cole??????

any ideas anyone

ok so now i'm a dumbass and have realised that it was the helaki guy, i should really wait and watch other episodes first lol