Cyphers call?!

Forgive me if this has already been discussed but ive recently rewatched the matrix, and this has been playing on my mind. In the 1st movie, when the crew are escaping the agents, Cypher makes a phone call to Dozer, who then asks Cypher to hang up...and essentially go and find a phone along with the rest of the crew nearby to call back from to exit the matrix! Why couldn't Dozer just extract Cypher from where he was???....he was literally on the phone!