WhatsApp has managed to reach a worldwide audience and break through 2 billion monthly users despite a severe handicap: The app doesn't support multiple devices for the same account. One phone number equals one phone or one tablet, that's always been the equation. And while there are workarounds to allow two different numbers on the same phone (for dual-SIM devices or Business users), there hasn't been any trick to make the same number available on two phones or tablets simultaneously. The great news is that WhatsApp is already working on this.

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