Contact GSMK

GSMK Gesellschaft für sichere Mobile Kommunikation mbH
Marienstrasse 11
D-10117 Berlin

Sales Department:

Service & Support:

Questions on Export Regulations:

General Inquiries:

Tel. +49 – (0)700 – 27 97 88 35
Fax. +49 – (0)700 – 27 97 83 29

For secure e-mail communications with GSMK, please encrypt your e-mails. Our GPG/PGP company key can be found here

  • Founded in 2003 to market two years of prior research and development in voice cryptography
  • First and only company to offer commercial off-the-shelf phones with strong encryption and published source code
  • Privately held by its investors and employees – no bank or venture capital funding and no government shareholders guarantee the company’s long-term stability and commitment to customers
  • Headquartered in Berlin, Germany
  • A customer base of substance in over 50 countries worldwide