Virtual cell phones.

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There are a few websites out there that want you to verify your membership buy giving them your cell phone number so they can send you your verification code by text message. My cell phone has text message capabilities, but I don't want to give my cell phone number out to these sites. Also not everyone has a cell phone anyway. What I want to know is, are there any free services out there on the internet that can give you a virtual cell phone that you can use to receive text messages online?