Why can 4G pseudo base stations be used in a 5G environment, but 2G pseudo base stations cannot?

This is due to the way cell phones operate: they constantly search for nearby base stations with better signals to reduce battery consumption and maintain stable communications. Although 2G pseudo base stations can provide stronger network signals, they cannot support high-speed communications. Only when there is no other signal, the mobile phone will select the 2G pseudo station to ensure basic communication needs. This principle is also the basis for 2G fake base stations that use an interference-based approach to send messages.