Beeztel for iPhone/iPad - Beeztel is a VoIP solution which allows you to make free calls to other Beeztel users over a 3G or WiFi connection. In addition, you can make low-cost calls to phones and landlines worldwide.
Beeztel is very easy to use. Simply install the app and, when you make a call, it will tell you if the call is free or cheap
textPlus Free Calls - textPlus gives you a phone number for making free and low-cost calls. Call other textPlus users anywhere in the world for free, and make cheap calls to mobile phones and landlines in the US and Canada.
In addition, the app lets you send free SMS to any US or Canadian mobile. Text messaging with other textPlus users worldwide is also free
Media5-fone Pro for iPhone - The Media5-fone is a softphone application for iPhone, iPod Touch and iPad. It is a SIP Client which enables users to make and receive VoIP calls. VoIP calls are calls established over a Wi-Fi or 3G connection using the IP technology of the Media5-fone
Bria for Android Tablets - Bria is a powerful VoIP softphone for Android tablets. It uses a 3G or WiFi connection to make and receive calls.
Bria offers superior audio quality with the included G.711, G.722, GSM, iLBC and SILK codecs
Media5-fone for iPhone - The Media5-fone is a softphone application for iPhone, iPod Touch and iPad. It is a SIP Client which enables users to make and receive VoIP calls. VoIP calls are calls established over a Wi-Fi or 3G connection using the IP technology of the Media5-fone
Bobsled Calling for iPhone/iPad - Bobsled Calling lets you make free calls to all your friends and family. Talk to any of your Facebook friends and make unlimited calls to any phone in US, Canada, and Puerto Rico.
Bobsled is a new way to communicate, centered around your social circle. This means one-touch calls with or without phone numbers
GlooboVoIP for iPhone - GlooboVoIP is a service which allows you to make free calls to your registered friends (on their smartphone, PC or VoIP phone), and cheap international calls. Just download the app, register in a few seconds and then make your first free call
Vivox - Vivox allows you to easily keep in touch with all your friends using your iPhone or iPod touch. With it, you can make free calls and chat with contacts who also have the app installed.
Vivox can also be used to make low-cost calls to landlines and mobile phones anywhere in the world. Download and install the app to receive free calling credits
Acrobits Softphone for iPhone is a reliable and highly customizable SIP Client for iPhone. It features push notifications, multitasking, Google Voice integration, and more.
Please note that Acrobits Softphone is a SIP Client, not a VoIP service. You must have service with a VoIP provider that supports use on a standard SIP client to use it
IMSDroid is the first fully featured open source SIP/IMS client for Android. It is also the only free Android SIP client which supports direct Video Calls.
3GPP IMS (IP Multimedia Subsystem) is the next generation network for delivering IP multimedia services. IMS is standardized by the 3rd Generation Partnership Project (3GPP)
