Service Providers (SP) refer to vendors that provide IT solutions and/or services to end users and organizations. Currently, a massive transformation is underway in service provider networks. Mobile and fixed network convergence, migrations to 5G, and emerging IoT services all create unprecedented opportunities for service providers – if their networks can deliver secure and reliable services. With new bandwidth and latency improvements also comes new vulnerabilities and an ever-expanding threat landscape. These articles discuss security topics about mobile network operators, 5G/IoT, and managed security service providers.