 Known as my Truphone the app allows apple iPhone eSIM compatible to download a sim over the air mapped to the world’s famous Truphone’s travel plan.Truphone's old VoIP application (known as Truphone App), was a separate product to the Tru SIM, allowing users to make calls over the internet to landline and mobile phone contacts, and free calls to other Truphone App users.Customers were also able to instant message contacts on other networks, such as Skype or Windows Live on selected devices.