YES, your prepaid phone card is compatible!
VOIP phone services such as Vonage, Roger's Home Phone and Bell Enhanced Services phones are 100% compatible with your prepaid phone card from Phone Card Depot.

Your calling card will always be able to call to or from a VOIP phone. 

If you use a VOIP phone, why use a long distance calling card? 
The right calling card will always be cheaper than a VOIP phone plan because calling cards are made specifically for long distance consumers that are budget conscious.  Calling card manufacturers will continue to to offer their budget conscious customers with competitive rates.  VOIP phone company's still charge for long distance calling, even though your call is being routed through the Internet at a much lower cost to the phone company. 

Should I get a VOIP phone?
Be careful with VOIP technology.  Remember that if the power goes out... so does your home VOIP phone line.  In a state of emergency, it is important that you are able to use your land line to call your loved ones.  A cell phone will only last as long as its battery life.