Compare VoIP

several VoIP providers.

"What do I need to look for when evaluating one VoIP provider versus another?"

It all depends on what you want to achieve. Your first step is to Google "Compare VoIP provider." Any of the sites listed there will help you make some comparisons. If price is your most important concern, you'll want to focus on the Ongoing Monthly Fees of each VoIP provider as well as their Long Distance Rates. If voice clarity or the reliability of the service are more important, visit some of the user forums and read what people are saying.

Most of the sites you'll find will allow you to enter your current area code and then they'll return the names of various VoIP providers with a list of plans available for your location.

Most of the sites will have a section on “VoIP Providers Reviews� where you can read (or write) a review.

"What are the different kinds of plans?"

Generally speaking, the VoIP providers will offer some or all of the following types of plans: PC-to-Phone, PC-to-PC, Cable Phone Service, Home, Business, and International Calls.

"What sorts of features do the different VoIP providers offer?"

In general, they'll some combination of the following basic features:
3 Way Calling
911
Caller ID
Voice Mail
Call Waiting
Keep Your Number

In addition, many of the VoIP providers will offer some more advanced features:
Call blocking (900 numbers, anonymous calls, directory assistance, telemarketer blocking, etc)
Call Hold
Call Transfer
Conference Calling
Fax capability
Directory assistance
Global travel
Speed dialing
Return call (*69)
Call forwarding
Voice mail
...and more.

Conclusion

Figure out what you want from a VoIP provider and then go shopping to compare pricing, features and availability in your area. Remember: it starts when you google "Compare VoIP providers."