it's both. it's a hardware device with an rj-11 (normal modular phone) jack and a basic line simulator that lets you make calls using SIP. there's also a (pretty cheap) service that is billed fairly infrequently. alternatively, you can use asterisk with the magicjack device; quick googling around shows that people have figured out what's necessary to get the two working together.
the downside is that it's not wireless, so you need a separate device speaking USB either way..
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