You know Apple is now allowing VoIP-over-3G apps such as AT&T wireless, after a change to the new beta version 3.2 of its iPhone SDK,Than if you are a globetrotter making a lot of long distance and international calls then you’ll know just how costly a call home can be.

VoIP for iPhone is your best solutions with this wide choice softphone that can run on iPhone, there’s literally no limit to the number of calls that can be made for free or at a massively reduced rate.Some of the iPhone VoIP solutions we’ve listed below are so slick and well integrated that they’ll blow your mind, while others require a little bit of tinkering. Nevertheless, if you’re looking to save money on your calls with mobile VoIP, particularly if you frequently travel internationally, there’s plenty to get started with!

Here are the best iphone 3G VoIP apps, services and tools. Go and check them out :

Skype on iphone

With these benefits of Skype, this VoIP service is a full featured VoIP solution for the iphone 2G/3G/3Gs
Instructions to download and install skype on appel iphone

iCall

like the skype, iCall for iphone is a free iphone 3G VoIP apps that hat lets you make and receive free or low-cost phone calls on your iphone or ipod touch anywhere you have a WiFi Internet connection ,3G networks such as AT&T wireless without any problem.
Check how Download and install iCall for iPhone/iPod touch

Tuitalk

Tuitalk is a program for Windows mobile and iphone powered cell phone that can be described as subsidized Skype. Like Skype, it allows you to make international (and domestic) phone calls to landlines and mobile phones in over 40 countries.
Review Tuitalk on iPhone and iPod touch for make free calls phone

fring iphone
fring is now available on the App Store, Fring for iPhone is a compelling VoIP caller and multinetwork chat app in one.

FEATURES

• fring calls over WiFi and 3G
• fring video calls over WiFi and 3G (one way)
• Instant Messaging
• Integrated dynamic friends list with real-time contact availability • SIP integration • Multiple Connection types
• Push notification support for fring, MSN Messenger®, Google Talk™, ICQ, SIP, Twitter, Yahoo!™ , AIM® communities
Guide to use and Download Fring for iPhone /iPod

Talkatone

A new VOIP app for iOS, a number of apps that allows for VOIP calls over 3G and Wi-Fi. With Talkatone, which is a Google Talk and Google Voice client, you can now make these free VoIP calls from i Phone, iPod Touch and iPad as well.

Guide to use and Download Talkatone for iphone iPod Touch and iPad