1. Privacy leakage problem: In communication engineering, it usually needs to involve some private information, such as personal call records and communication contents. If this information is leaked, it will lead to the violation of personal privacy. For example, in 2015, the U.S. NSA was exposed to have wiretapped the communications of dignitaries in many countries, causing a strong backlash from the international community.

2. Fake Base Station Problem: Fake base stations are communication devices disguised as base stations that can be used to monitor and track wireless communication data. If fake base stations are used to illegally monitor personal communications, they will pose a serious threat to personal privacy. For example, the use of fake base stations for large-scale personal communications monitoring was seen in certain areas of mainland China in 2018.

3. Network security issues: network security is a very important issue in communications engineering. Some communication systems may be susceptible to hacking, leading to infrastructure paralysis and data leakage. For example, in 2013, American Target was hacked because of security vulnerabilities, leading to the theft of millions of users' personal information.

4. Political security issues: communications engineering may involve some political security issues, such as communication restrictions in the frontier and Tibetan areas and network blockades. Such issues are often also linked to subtle ethical and legal issues such as privacy leakage and freedom of speech. In summary, the cases related to the ethics of communications engineering are diverse, including issues of privacy, security, and making clone calls, any of which require strict ethical and legal compliance in their design and use to safeguard the rights and interests of individuals and society.