I also Love Localphone, Cheap and good quality Calls worldwide, 5 mins free trial

Very Cool! I think most of the people who make voip call must have been known about Localphone from UK, the Rates is very cheap, quality is very good, I strongly recommend it if you are still looking for cheap and good quality international voip call. Click the below image to sign up:
For Students:

For others

Tropo is PERFECT for free voice call and virtual numbers

I've been used tropo free account as a developer for quite a time, and found it was such a great service, I am not that good at writing code but also can use Tropo with the help of my friend. 

Tropo is a powerful yet simple API that adds Voice, SMS, Twitter, and IM support to the programming languages you already know.

Sign up for an account (It's Free!)

Create an application and get a phone number (also free)

Make a phone call (still free)

Send a text message (yep, still free)

Here I share my experiences about using tropo in the voice app, such as use SKYPE to call free international call:

ring2me give a virtual number for your SkypeIn covered 30 Countries

Last time, we talked about Teleku offered SkypeOut free to USA or CA and free to other countries by using the access number of freecallpin and freephone2phone.

Today ring2me offers you a virtual phone number for SkypeIn, it covered the following 30 Countries:

QuickFuse offers Drag and drop voice apps and gives you $30 free call to USA and CA, and offers an Toll-free number

Quick Fuse offer very funny apps: Drag and drop voice apps and $30 for you to use the apps you build. $30 can call USA and CA free.

It also offers a free Toll-Free number, valid for one month. However the $30 will only expire after you spend it out.

What is that Drag and drop voice apps ? Pleasee see below picture:

GULFSIP offers 10 international SMS per day (recommended)

I want to say thank you to my friend Linshao who told me this wonderful GULFSIP, I found it is a perfect free SMS services for me since I need to send free SMS to Europe, most free SMS in other websites cannot be well receieved successfully, but GULFSIP can, I sent SMS to my family in Bulagria, it worked very well. So this GULFSIP is just a wonderful free services in SMS, hope it can last long.

GULFSIP, I love you.