Yes, Google Voice is tied to a phone#, however it is not one that has to be on your phone. Google voice gives you your own phone# & it is your choice to link it to your phone or not.
What are really trying to do? Text messages by definition are attached to a phone #. There are plenty of chatting apps that use a data connection (Google Talk, KIK messenger, etc), but if you want a true SMS, it has to be linked to a phone #.
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