For mobile users juggling a bunch of different devices, Google Voice can be something of a godsend. Not only does it let you share a single point of contact through which people can reach you no matter which phone or tablet you're carrying at the moment, but it does so without requiring the party on the other end to install a specific app — everything travels over regular voice calls and text messages. While that's great for compatibility, there are a number of reasons why you might not want to rely so heavily on the voice-call network, from running low on your monthly minute allocation, to difficulty finding a reliable cellular signal.

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