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Rose is in the alternate universe named "Pete's World" by the Doctor. As shown at the end of "Doomsday", there's normally no connection between universes through which to send a signal. Even when there is (as there was, briefly, then), it requires a vast amount of power to do it; the Doctor needed to use a supernova as a power source to send his message. Rose's phone can't send a signal between universes.