Can I use VoIP on my cell phone number?

There are a range of services available in this category. A service known as Fring, which comes free and is operational on Nokia/ Symbian, Window Mobile and iPhone that allows its users to make VoIP calls on SIP network. Fringe incidentally is a IM client, which is multi protocol. What this essentially means that apart from making calls, you can chat with friends on Yahoo, MSN, G talk and Skype for free.

In case you are using a Java based phone, a Symbian or a Window Mobile you can make free VoIP calls and chat with a service known as Talkonaut.

Nimbuzz is another VoIP service available for free on Java and Symbian based cellphones. The advantages of Nimbuzz are multi fold and you can not only conduct VoIP calls but also share photos and videos.

Gizmo5 is another service that allows VoIP calls for free but charges for landline calls and SMS service to mobile.

Gizmo5 is another service that allows VoIP calls for free but charges for landline calls and SMS service to mobile. iSkoot is one innovative service that is available for you in case you are using a BlackBerry phone. It is an hybrid between VoIP and GSM service, you will be charged for mobile minutes in case you desire to make a VoIP call. However, it is great option in case you need to keep in touch with your Skype contacts.

Hope this information helps you shortlist and prioritize your options.