The Evolution of Signal Blockers in the Era of 5G

Adapting to the Changing Frequencies of Mobile Communication

A decade ago, during the 2G and 3G era, it was relatively easy to design signal blockers that only interfered with voice calls while allowing data transmission. This was due to the clear division of frequency bands at that time. 2G networks primarily handled voice calls, while 3G networks supported both voice and data transmission. To retain voice call functionality, signal blockers only needed to keep the 3G frequency band open.

However, the 2G frequency band still accommodated low-speed data communication, which was insufficient to meet the growing data demands of mobile applications. Despite this limitation, the communication landscape progressed, and with the advent of 4G and now 5G networks, the division of communication frequencies in mobile phones underwent significant adjustments.

The Shift from 2G to 5G

The original 2G frequency band no longer exists, and many regions have dismantled their 2G network infrastructure. Additionally, a significant portion of the 3G frequency band has been repurposed for 4G usage. Furthermore, modern smartphones that support 3G, 4G, and 5G networks are designed to handle both voice and data simultaneously. Consequently, it has become increasingly challenging to differentiate voice and data transmission based solely on the working frequencies of mobile phones.

Implications for Signal Blockers

The evolution of communication frequencies poses a considerable challenge for signal blockers. In the past, signal blockers could easily target specific frequency bands to block voice calls while allowing data transmission. However, with the convergence of voice and data on the same frequencies, it has become difficult to effectively distinguish between the two.


As the telecommunications industry continues to advance, the division of communication frequencies in mobile phones has undergone significant changes. The transition from 2G to 5G networks has rendered the previous methods of differentiating voice and data transmission obsolete. Consequently, signal blockers face the challenge of adapting to this new landscape, where voice and data are intertwined on the same frequencies. As technology progresses, it is crucial for signal blockers to evolve and find innovative solutions to meet the changing demands of mobile communication.