Aspects of the disclosure relate to methods, systems, and computing platforms for authenticating activity on another computing device in real-time using a mobile device on a high generation cellular network. Aspects of the disclosure leverage and utilize a user's mobile device connected to a high generation cellular network to collect and analyze data about a user to seamlessly identify and prevent potentially fraudulent transactions. More specifically, the present disclosure uses high generation cellular networks, such as a fifth-generation (“5G”) cellular network, to seamlessly, frequently, and repeatedly monitor a user through a 5G mobile device to provide a variation on two-factor authentication. Aspects of the disclosure provide effective, efficient, scalable, fast, reliable, and convenient technical solutions that address and overcome the technical problems associated with monitoring and preventing in real-time potential fraudulent transactions without burdening users (e.g., credit card holders, debit card holders, account holders, and others).