Initial release2010; 14 years ago (2010)
Final releaseiOS 2.4 (November 26, 2014; 9 years ago (2014-11-26)[1]) [±]

Android 2.0.2 (February 12, 2014; 9 years ago (2014-02-12)) [±]
Windows Phone 7.x (September 12, 2013; 10 years ago (2013-09-12)) [±]
Windows Phone 8.x (September 18, 2013; 10 years ago (2013-09-18)) [±]
BlackBerry OS 1.0.1 (May 31, 2013; 10 years ago (2013-05-31)) [±]

Kindle Fire 2.0 (December 19, 2013; 10 years ago (2013-12-19)[2]) [±]
Operating systemAndroid, iOS, Windows Phone, BlackBerry OS
Available inEnglish, German, Italian, Spanish, Russian, Portuguese, French, Catalan[3]
TypeVoice over IP, instant messaging

Upptalk (formerly known as Yuilop[4]) was a proprietary voice-over-IP service and software application that provided mobile phone numbers in the cloud and allows users to call or text any phone for free[5][6] whether or not the device receiving the calls and texts has the Yuilop application.[7][8] The service was discontinued in 2017 and even its domain was abandoned.[9]

Yuilop provided phone numbers can be accessed across any device on the internet (IP) and are reachable via regular phone calls (PSTN) from any landline or mobile phone, and SMS. Calls and chats to other users within the yuilop network service are free of charge. Unlike most other VoIP services, yuilop does not charge for off network communication. Calls and SMS to landline telephones and mobile phones use virtual credits that are earned for free through participating in promotional activities and using the app. Yuilop does not require credit for national calls and SMS in the U.S. Yuilop has additional features, including instant messaging, group chat, and location, and photo sharing. Competitors include Skype, Viber and Google Voice.


Yuilop was created by former simyo CEO, Jochen Doppelhammer in November 2010.[7][10][11] Yuilop's headquarters are located in Barcelona, Spain[12][13] and the app is available in over 200 countries including the United States, United Kingdom, Germany, Italy, Spain, Israel, and Mexico.[14]

The app had approximately 5 million users and is available on Android, iOS, Windows Phone, BlackBerry OS.[15]

As of July 2013, Yuilop has raised approximately $9 million in funding from investors such as Nauta Capital,[16] Shortcut Ventures GmbH,[17] Bright Capital, and the Spanish government.[11]

In 2014, the company UppTalk entered insolvency procedures.[18]

Yuilop's services are split into two main categories:


Yuilop provides free calling and texting between Yuilop users as well as to mobile and landline numbers not in the Yuilop network. Yuilop allows these registered users to communicate through instant messaging, SMS, voice chat, and calling with yuilop.me. Yuilop's text chat client allows group chats, emoticons, photo sharing, and location sharing.


Yuilop.me is an option to receive a virtual mobile phone number. The number can be used across devices with access to the internet and is not tied to a SIM card or an operator. Yuilop.me is currently available to Yuilop users in the United States, the United Kingdom, Germany and Spain.


Calls and instant messages made to other Yuilop users via the app are free and unlimited. Calls and SMS made to mobile phones and land lines use "credits". Credits are acquired by:[19]

Version 1.9 of the iOS app also allows users to purchase credits.[20]

The number of credits used to call mobile phone and land lines is determined by the location to which the call or SMS is sent. Sending calls or SMS to mobile phones requires no credit in or between some countries, such as the United States.[21]


Yuilop used a 2048 bit encryption to encrypt data traffic and call signalling over any transport medium (Wi-Fi, 2G, 3G, 4G LTE). A STARTTLS extension is used through a Transport Layer Security protocol.[citation needed]

See also


  1. ^ http://www.mod-gadget.com/upptalk-app-updated-ipad/
  2. ^ "yuilop - Free texts and SMS". Amazon. Retrieved 10 March 2014.
  3. ^ "Yuilop". Softphonic. Retrieved 11 November 2013.
  4. ^ Upptalk FAQs Archived 2014-01-16 at the Wayback Machine,.
  5. ^ Woods, Ben (2013-08-13). "Free Yuilop calls come to the UK with permanent phone numbers and promise of video messaging one day". The Next Web. Retrieved 13 August 2013.
  6. ^ Shukla, Shikha (2013-07-19). "Apps inspire youth to communicate creatively". The Hindu. Retrieved 13 August 2013.
  7. ^ a b Nölkel, Lenz (2013-07-07). "Yuilop - competition for WhatsApp and Skype". Gizmodo.de. Archived from the original on 2015-03-15. Retrieved 8 July 2013.
  8. ^ Brüggemann, Christian (2012-11-16). "yuilop Text & Call Free_to_All / yuilop Gratis Telefonieren+SMS". AndroidPit. Archived from the original on 2013-07-28. Retrieved 8 July 2013.
  9. ^ A. PIJUÁN (31 October 2017). "Grupo MásMóvil pone punto y final a UppTalk: cesa su actividad y disuelve la sociedad". Kippel 01 (in Spanish). Retrieved 5 May 2020. los clientes de UppTalk ya han sido notificados de la interrupción del servicio y el dominio de la página web oficial de la aplicación ya ha caducado
  10. ^ Novoa, Jaime (18 July 2013). "yuilop 1.9 for iOS and Android now available". Genbeta. Retrieved 26 July 2013.
  11. ^ a b Lomas, Natasha (2013-02-28). "With "Millions" Of Users In 40+ Countries, European Messaging Startup Yuilop Prepares For U.S. Launch In "One To Two Weeks"". TechCrunch. Retrieved 8 July 2013.
  12. ^ Lomas, Natasha (2012-11-22). "Samba Mobile And Yuilop, Two European Free 3G Services Startups, Sign Strategic Partnership To Cross-Promote Offerings". TechCrunch. Retrieved 8 July 2013.
  13. ^ Wauters, Robin (2011-03-22). "Yuilop raises €1 million for social communication app". TechCrunch. Retrieved 8 July 2013.
  14. ^ Fowler, Nina (23 May 2012). "Shortcut Ventures places first bet – on "free talk for all" startup Yuilop". Venture Village. Archived from the original on 8 June 2013. Retrieved 16 July 2013.
  15. ^ "About Us". Yuilop. Archived from the original on 8 July 2013. Retrieved 12 July 2013.
  16. ^ "Yuilop raises seed financing worth EUR 1 million". Telecompaper. 2011-03-23. Retrieved 26 July 2013.
  17. ^ "Yuilop Raises €4.5M In Series A Funding". FinSMEs. 2012-05-23. Retrieved 8 July 2013.
  18. ^ Jaime Novoa (2014-10-31). "UppTalk enters insolvency procedures as co-founder remains hopeful about recovery". Novobrief.
  19. ^ "How to earn energy". Yuilop. Archived from the original on 7 July 2013. Retrieved 10 July 2013.
  20. ^ "yuilop Releases Version 1.9 for iOS and Android Worldwide". Yuilop. Archived from the original on 2 August 2013. Retrieved 17 July 2013.
  21. ^ "Outgoing SMS – new values". Yuilop. Archived from the original on 17 July 2013. Retrieved 10 July 2013.