VoIP

Vopium is all mobile as in normally software requires both the caller and the receiver to sit in front of computer where as in case of Vopium you can call from your mobile phone. Vopium allows you to save up to 90% when making international calls or sending SMS from your mobile phone in your home country - and this without changing your current operator or SIM-card. You pay your mobile provider for a local call and Vopium for the international call. With Vopium WiFi you can even make 100% free calls and avoid roaming charges when abroad. Vopium seems to be different from many other VoIP service as it routes calls to either GSM WIFI and SIP based on its intelligent software so that users gets less costs while calling international.
Vopium is available for over 500 GSM handsets from over 20 hardware vendors and they impressively have very detailed how to guides with screenshots on their website http://vopium.com/handsets.
Here is how you can get free Vopium software
Vopium is a free software application which is installed on your mobile phone. Here is how you get it on your phone

STEP 1 you send a message "Get" to +447781480717 .

Step 2 you receive a SMS text message with a link to the application. You download by clicking on the link or opening it via options. The download typically takes less than a minute.

Once installed you are entitled to use 30 Minutes free and 30 SMS.
Vopium is the first mobile VoIP provider to offer mobile backup - a free service which allows Vopium customers to store their address book contacts and calendar securely online. Integrated with the Vopium application, Vopium Sync backs up a user’s contacts and calendar direct to their online Vopium account. If a user loses their phone, all they need to do is log on to their Vopium account and retrieve their saved contacts and calendar items. They can also log into their online account at any time and edit contacts and calendar items.