sentences:  The C-Netz was officially introduced in 1985 (with unofficial trials in 1984) to replace the existing B-Netz/B2-Netz system used in Germany at the time.Due to problems with the B-Netz mobile networks, early adoption of C-Netz was very high, especially in rural areas which had lacked prior B-Netz coverage.However, like other first-generation analog systems, it suffered from poor call quality and was susceptible to eavesdropping.