An EMF blocker can do exactly what you want if the goal is to disconnect a phone. Put it in a properly closed Faraday pouch that shields its cellular and Wi-Fi bands and calls over those bands stop coming through. If you want to take the call, follow directions or keep an emergency contact within reach, you have a different problem to solve.
A shielding phone case can reduce the field on one side. The result depends on which side faces you, where the antenna sits and how the phone responds to its network. A meter reading behind the flap tells you about that spot. The space around your head or desk also receives signals from other directions, including nearby devices and reflections.
At Aires, we study what can be changed about that environment while the phone stays connected. The comparisons below take you from shielding tests to studies of the Aires resonator. If you already know which approach you want, compare Aires EMF protection devices.
What is an EMF blocker?
“EMF blocker” is a common shopping term for products intended to reduce electromagnetic exposure or its effects. It covers different technologies: conductive phone cases, Faraday pouches, shielding materials and products sold as stickers or wearables. The word describes what the shopper wants; the product’s construction and testing explain what it actually does. See the EMF blocker review by product type for a category-by-category comparison.
Compare the product with its intended job
| Approach | Intended job | Useful test |
|---|---|---|
| Conductive phone case or directional shield | Reduce RF reaching a selected region while leaving the phone usable. | Test the assembled phone and case in stated orientations and operating modes, including the network’s power response. |
| Faraday pouch or enclosure | Attenuate radio signals entering and leaving the enclosed device. | Test the closed enclosure across the claimed cellular, Wi-Fi, Bluetooth or other bands, including seams and closure. |
| Shielding fabric, paint or room installation | Reduce particular fields along the installed shielding path. | Measure the relevant frequencies and positions before and after installation, with doors, windows and internal transmitters accounted for. |
| Aires semiconductor resonator | Interact with incident electromagnetic fields through an engineered surface. | Examine resonator-specific physical studies and the biological studies that test the claimed endpoint. |
Partial shielding is a measurement question
A shield does not have to surround a source completely to change the field at a particular location. It can reflect, absorb or redirect energy. A complete enclosure is useful when the goal is isolation in all directions, but real enclosures still have frequency-dependent leakage. The result depends on construction, geometry and the source.
A phone that still connects is therefore not proof that a shield has done nothing. Conversely, a lower reading behind one part of a case is not a complete map of exposure around the user. Match the test to the actual use position and the claimed reduction.
EMF blocking, reflection and interference
A shield interacts with a field; it does not simply erase it. Reflected paths can combine constructively or destructively, changing signal strength from one location to another. Cisco’s multipath engineering guide explains those effects. This is why a measurement behind one panel cannot describe the field around an entire phone or room.
The practical question is how the shield performs where you actually use it. For a fuller explanation of reflection, power control and the Aires resonator approach, read EMF blocking versus field modulation.
Phone power control changes the comparison
Phones adapt their transmit power within network and device limits. 3GPP TS 38.213, section 7 describes the NR uplink power-control process. An accessory that worsens the radio link can cause the phone to use more transmit power, but the net exposure result depends on the accessory, phone and network conditions. It must be measured; an automatic increase in every circumstance should not be assumed.
ARPANSA discusses this distinction between fixed-power accessory tests and operation with automatic power control. A useful report states whether it tested the material alone, the assembled product at fixed power, or the phone on a live or simulated network.
Faraday bags: test the whole enclosure
A properly performing RF enclosure can isolate a phone from the radio services within its tested bands. Calls and data using those services are then unavailable while the device is enclosed. NIST’s mobile-device forensics guidance explains that inadequate attenuation, seams and leakage can defeat isolation. A missed call is a useful spot check, not a comprehensive test of every band or closure condition.
Where Aires fits
Aires products are built around patterned semiconductor resonators and are designed for use alongside connected devices. The research question is how that structure responds to an incident field and how the tested devices relate to physiological and cellular measurements.
The Springer simulation models a stable, multifrequency electric-field distribution across the resonator surface. Its original paper documents the model. The 2016 VGTU Phase I laboratory report reports field-amplitude changes for specified source and receiver arrangements, including an average electric-field decrease of approximately 27% with the resonator directly in front of the laboratory transmitter in the reported 0.9–2.5 GHz setup. The measured difference changed with receiver distance. Phase II and Phase III extend the laboratory work to resonator groups and arrangements.
If you repeated the measurement from a different seat at the desk, you could get a different reading. The laboratory report gives the transmitter position and receiver distances so you can see exactly where the change occurred. The Aires scientific framework connects the modeling, laboratory and biological research.
From a field measurement to a biological endpoint
The 2019 rat chromosome study measured cell-level responses under a defined Wi-Fi exposure protocol, with lower aberration frequencies in two selected rat lines when Aires resonators were present. Read the original study for the exposure arrangement and results by line.
Human research includes Datova’s 13-volunteer HRV investigation. Its tables record a lower stress index after 20 minutes with an Aires device in 12 of the 13 volunteers, in a before-and-after protocol. Open Datova’s original report and PACE’s expert peer review, or use the cardiovascular-research guide to compare this work with later reports.
A field reading, HRV index and chromosome measurement each answer a specific question. The value of the Aires research program is that these different lines of investigation are available to inspect and connect.
How the research connects across decades
The research program connects its original environmental-tuning thesis to increasingly detailed physical and biological tests. In the 2026 Sysoev–Budko publication, the authors report EEG recovery after initial activation with Lifetune ONE and increased coherence following seven days of regular use. The study summary connects the published findings to the earlier report versions.
The 2026 ICICT infrared paper adds measurements of the patterned silicon surface during heating and cooling. Follow its experiment summary, the distinct 2025 Lifetune Zone Max rat study, and the research timeline to trace the progression from physics to measured biological responses.
A practical decision guide
- Want a phone temporarily disconnected? Look for enclosure tests covering the radios you intend to isolate.
- Want to reduce RF in a particular position? Look for measurements of the complete setup, including phone power control and orientation.
- Want to evaluate Aires? Follow the tested resonator, field conditions and biological endpoint through the research archive.
- Want everyday exposure choices? Start with device placement and settings in the Wi-Fi guide and your device’s operating instructions.
Frequently asked questions
Can I block all phone signals and still make calls?
Not over the isolated radio services. A phone inside an enclosure that fully isolates its cellular, Wi-Fi and Bluetooth connections cannot use those connections while enclosed. Partial shielding is a different case: it may reduce fields in particular positions while some communication continues.
Is Aires an EMF blocker?
Aires belongs in the comparison when you are shopping for EMF protection. Its mechanism is a patterned semiconductor resonator designed for use with connected devices. It is not a Faraday enclosure. Explore the device-specific research and compare Aires bestsellers.
Do EMF-blocking phone cases work?
Some designs can attenuate RF in particular positions. Their performance needs product-specific testing that reflects how the case and phone are actually used.
Does a shielding material’s percentage apply to the entire phone?
A material test measures the material in its test fixture. Whole-product performance also depends on gaps, orientation, antennas and the phone’s operation.
Is all EMF the same?
No. Radiofrequency fields from wireless communication differ from static and low-frequency fields. A result at one frequency should be identified by that frequency and test setup.
How is Aires different from a Faraday pouch?
A pouch is intended to isolate radio signals. Aires uses a patterned resonator designed for use alongside connected devices. Read the studies behind the device. If you have seen the chamber demonstration, compare the 146.4 MHz test with the Aires research.
Continue with the guide to EMF stickers and attached devices, Aires research overview or Aires personal-device collection.
Updated November 4, 2026 · Josh, Aires. Original research, engineering sources and study summaries are linked above.