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Device Based VoIP Services
Device Based VoIP services are good for people who don't want to get bothered with monthly bills. You buy a piece of hardware and you make free calls ever after.

Mobile VoIP Services
It is great to bring the benefits of VoIP to your mobile phone. It allows you to considerably cut down your mobile communication costs. You can also, in certain cases, make calls for free, even international calls. But there are certain prerequisites that you already need to have, like a phone compatible with the service and a data connection plan.

Software Based VoIP Services
Software Based VoIP Services allow users to make free calls to other people using the same service on their computers to any destination in the world. The calls are make through an application called a softphone installed on a computer or portable device. Read more here on this kind of VoIP service.

Subscription/Hardware Based VoIP Service
Hardware-Based or Subscription-Based VoIP Services are very common for households and small businesses. It is best suited for people who want to use VoIP the same way as they do traditional landline phone. The ATA (phone adapter) can be used to connect existing phones and an ADSL Internet line. No need for a PC.

Ooma - Hardware Based Free VoIP Service
Ooma is a new company launched in 2005 that wants to revolutionize the VoIP by making the service free for a life time. In September 2007, they launch a package whereby you buy their hardware and use their service for free.

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