tellows Supports Projects for Scientific Research and Development

Tellows, the free telephone caller ID service, has developed its own API to facilitate the development of apps and programs. The tellows API contains the database of millions phone numbers in over 40 countries. This gives students, researchers and companies the opportunity to design their own project using the tellows API.

Leipzig, Germany, July 18, 2018 --( tellows is a reverse telephone directory website based on the reports of users. Users can report unwanted calls and leave a so-called tellows score. Through the different categories of the calls, other users may estimate the danger of the phone numbers and prevent any risk. tellows has been active in more than 40 countries since 2009. It provides a wide database with information about millions of reported telephone numbers worldwide.

tellows has developed its own API (application programming interface) to support the development of apps and programs, by facilitating the access to its database. The tellows API as a broad database contains not only the overview of reported phone numbers, but also reveals the different types of call, the location of the caller, the number of available comments, and many more. The API enables the collaboration between tellows and universities and research institutes by supplying the database with millions of phone numbers in over 40 countries all around the world. In the last few years, tellows and various scientific researchers have successfully created several projects:

SMS Filtering App in Indonesia
In 2016, three Indonesian students carried out a successful student project, in which they developed an SMS app. The app categorizes text messages automatically into six different types: trusted text messages, banking, advertisements, phone operators, fraud and unknown. tellows provided the students the database with more than 1000 Indonesian phone numbers, which enable the classifying of the different categories and to recognize the type of message received.

Caller ID Projects by fellow French Students
In the recent May of 2018, the students of UPMC University in Paris created another successful project with tellows API. They developed a Caller ID that identifies French phone numbers and indicate immediately whether the phone number is trustworthy. With the help of the API incoming calls automatically display the corresponding tellows Score with the indication on the danger of the number.

Further information about this project:

Every month, over seven million people use tellows. In order for all users to benefit from it, the information about the phone numbers is published and used to prevent any unwanted calls. tellows also provides information for consumer protection purposes in the media field. In 2017, the BBC published an article about call distribution with statistical references provided by tellows.

tellows as an international project offers a wide range of knowledge and cooperates with universities on various student projects to support scientific research and development. Within the company, tellows offers exchange students the opportunity to gain practical experience. tellows participates in numerous funding programs, such as the Erasmus Plus program.

For further details about scientific work support by tellows, please contact tellows directly at:

The API can also be used by companies.

Further Links:
Android App:
iPhone App:

Christian Anton
tellows UG (haftungsbeschränkt)
Eschenring 6
04282 Bennewitz

Tel.: +49 341- 35540902
Mobil: 0152 – 28754986
Fax: +49 341 – 35540902

The phone number community makes it possible for consumers to enter information and comments on numbers, besides others, on,,,,, and In this way, Tellows shall prevent consumers from being deceived. Commercial registry: Magistrates' Court Leipzig HRB 26291, managing director: Stefan Rick
tellows UG
Chris Anton
+49 – 1578 – 4918966
Eschenring 6
04282 Bennewitz