Understanding the Compatibility Issues of 4G Signal Blockers with 5G Phones

Exploring the Overlapping Frequency Bands and the Need for New 5G Signal Blockers

As the world transitions to 5G technology, many customers have raised concerns about the compatibility of their existing 4G signal blockers with the latest 5G smartphones. While some users have reported partial blocking of 5G signals, others have experienced inconsistent results. As a leading manufacturer of 5G signal blockers, we aim to address these concerns and shed light on the underlying reasons behind this phenomenon.

The Overlapping Frequency Bands:

The current generation of 5G smartphones operates on specific frequency bands, some of which overlap with the 2.3-2.4GHz frequency band used by 4G networks. When a signal blocker is activated, it also affects these overlapping frequencies, resulting in partial blocking or unstable signal reception. It is important to note that this overlap is only a fraction of the overall frequency range, leading to the observed limitations in blocking 5G signals.

Identifying the Overlapping Frequency Bands:

According to publicly available information from the Ministry of Industry and Information Technology, the frequency bands allocated to different network operators for 5G are as follows: 758-788MHz, 2515-2675MHz, 3400-3600MHz, and 4800-4960MHz. Among these bands, the 2515-2675MHz range, assigned to China Mobile, overlaps with the 2555-2655MHz band previously used for 4G. However, China Mobile actually utilizes the 2535-2635MHz range, which spans a total bandwidth of 100MHz. In older 4G signal blockers, the blocking module for the 2.5G frequency band often covers this 100MHz bandwidth, leading to the partial blocking of certain 5G smartphones.

Exceptions and Future Solutions:

In some densely populated areas or specific hotspots, certain network operators have been observed to exceed the frequency bandwidth usage specified by the Ministry of Industry and Information Technology. These operators have utilized 5G signals within the other 2.3-2.4GHz frequency bands. However, such instances are rare and isolated. Even if this were the case, new 5G signal blockers are designed to effectively block all 2.3-2.4GHz signals, ensuring comprehensive signal blocking capabilities.


The compatibility issues between 4G signal blockers and 5G smartphones arise due to the overlapping frequency bands used by both technologies. While older signal blockers may partially block 5G signals, new 5G signal blockers have been developed to address this issue. By understanding the specific frequency bands used by different network operators and the limitations of older signal blockers, customers can make informed decisions when choosing signal blocking devices for their 5G smartphones.