Wikipedia
Vyke
Vyke make mobile apps which provide users with additional mobile phone numbers, free calls and instant messaging and low cost calls and SMS for iPhone and Android devices.
Vyke connects a user with any phone at a very low cost, without the need for both parties to be signed up to the service, and has been described as almost free. In 2016 Vyke added extra mobile phone numbers and free calls and instant messages to other Vyke users to the app.
Vyke headquarters are in London, UK.