Truphone

Cellnetrix GmbH is a research and development company based in Hamburg, Germany, with an additional office in Russia. Founded in 2006, it specializes in developing software aimed at improving the security and reliability of wireless mobility and Internet services. The company focuses on embedded software solutions for universal subscriber identity modules (USIM) across various mobile networks, including GSM, UMTS, and CDMA, as well as WLAN and Internet applications. Cellnetrix provides secure mobile applications, full-scale Over-the-Air management services for (U)SIM and R-UIM cards, and develops customized software stacks for small power-constrained devices such as smart cards and embedded (U)SIMs. Its technologies are aligned with industry standards set by organizations such as the Open Mobile Alliance, 3GPP, ETSI, and Global Platform, enabling telecommunications operators and hardware manufacturers to deliver innovative products to consumers. The company operates as a subsidiary of Truphone Limited.

CoSwitched is a mobile virtual network operator focused on democratizing access to the Internet for devices while facilitating advanced voice communication between machines. By offering a platform that enhances connectivity for Internet of Things devices, CoSwitched aims to bridge the gap in digital communication, ensuring that various devices can effectively communicate and operate seamlessly in an increasingly interconnected world.

Sim4travel, now known as S4T Plc, is a company based in London, United Kingdom, that previously focused on offering low-cost mobile phone solutions for travelers. The company specialized in providing subscriber identity modules (SIMs) that allowed users to receive free incoming calls while abroad by using temporary travel SIM cards. Although S4T Plc currently does not have significant operations, it aims to explore new technologies and market opportunities. It operates as a subsidiary of Software Cellular Network Limited.