Just wondering if I buy this used unit if I will be forced to get service from Vonage or if I could use it to sign up with another company's service. As you can likely tell I know very very little about VoiP service 
Just wondering if I buy this used unit if I will be forced to get service from Vonage or if I could use it to sign up with another company's service. As you can likely tell I know very very little about VoiP service
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You can. However, you need to unlock it, which from a brief study appears to not work in every instance.
In other words, yes, BUT "your mileage may vary", "will void warranty", "let the buyer beware", and "good luck".