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Voicemail deposit charges (airtime plus long distance) may apply while roaming internationally. You aren't charged if your phone is off when the call goes to voicemail. This is because the network does not attempt to deliver the call if your phone is off. If a call goes to voicemail while your phone is on, you are charged twice. First, to deliver the call to a foreign carrier. Second, to route the unanswered call back to the U.S. voicemail system.