Stefan Borgschulte

Part of Telefónica SA, Ortel Mobile GmbH is a telecommunications company that offers affordable prepaid mobile services for international calling, including a Germany-wide flat rate. The company is based in Dusseldorf, Germany. The company also provides a mobile app for customers to manage their accounts, including checking and adding credit and changing options, available in nine languages for both iPhone and Android. Additionally, Ortel Mobile offers EU roaming services without additional fees in all countries. Ortel Mobile was founded in 2005 and is led by CEOs Thorsten Wagner, Gregor Fränzel, and Stefan Borgschulte.

Part of Telefónica SA, AY YILDIZ Communications GmbH is a mobile communications company based in Dusseldorf, Germany. The German company offers affordable mobile phone services for those traveling to and within Turkey, including phone and internet plans. Customers can manage their accounts and usage through the company's app, available for download. The CEOs of the company are Thorsten Wagner, Stefan Borgschulte, Alfons Lösing.