The Truphone VoIP application is currently available for iOS 6 and Android Jelly Bean devices. Legacy versions of the app are also downloadable from some areas on the internet for BlackBerry, Nokia Symbian, and Desktop — including Apple Mac OS, Windows 7 and earlier, and Linux devices — with updated versions coming soon for BlackBerry 10, Desktop and even Windows Phone 8. The current iterations of the app support calling over Wi-Fi and 3G networks. Legacy apps all support Wi-Fi calling except for the BlackBerry version, which utilized Tru Anywhere, a method of use in which the local minutes of the user are used to connect the call to a local Truphone server.
As of the release of version 5 in November 2012, text messaging functionality has been removed from the iOS and Android applications and the application has been removed for the iPad. Sources with Truphone confirm that text messaging will be restored at a later date. Recent rumors also point to the VoIP application and GSM SIM service working on the same user accounts in the near future.
Truphone applications use the Session Initiation Protocol (SIP) open standard, which competes with other VoIP standards such as UMA and proprietary protocols such as the Skype protocol.