--- topic: EMF & Wireless Radiation title: Practical Precautions order: 2 description: Simple, cost-free steps to reduce RF exposure if you want to err on the side of caution — without going overboard. question: "How can I cut phone and WiFi radiation exposure without wasting money?" answer: "Keeping your phone off your body and using speakerphone or wired headphones may reduce any RF risk for free; shielding products are unproven." actions: - "Use speakerphone or wired headphones for calls: doubling your distance from the source cuts RF exposure to one quarter [1]." - "Keep your phone out of your pocket, and put the WiFi router a few feet from where you sit or sleep [2]." - "Put your phone on airplane mode at night or charge it in another room; it also helps sleep." cautions: - "Children and pregnant women may want extra precaution: WHO urges more research on children; avoid resting devices on the abdomen [1]." - "Skip EMF-blocking cases, stickers and pendants, which can make your phone transmit harder; \"dirty electricity\" filters lack strong evidence [3]." confidence: 2 confidenceNote: "Distance cuts exposure by physics (inverse-square), but no cited study shows these steps change health outcomes; harm at normal exposure is unproven." evidenceSummary: newestStudyYear: 2018 references: - id: "1" url: "https://www.who.int/news-room/questions-and-answers/item/radiation-electromagnetic-fields" title: "Electromagnetic Fields and Public Health: Mobile Phones" authors: "World Health Organization" year: 2014 journal: "WHO" - id: "2" pmid: "28074013" title: "Exposure to Radiofrequency Electromagnetic Fields from WiFi in Australian Schools" authors: "Karipidis K, Henderson S, Wijayasinghe D, Tjong L, Tinker R" year: 2017 journal: "Radiation Protection Dosimetry" - id: "3" pmid: "30690250" title: "Radiofrequency electromagnetic field exposure and risk perception: A pilot experimental study" authors: "Zeleke BM, Bhatt CR, Brzozek C, Abramson MJ, Freudenstein F, Croft RJ, Wiedemann P, Benke G" year: 2018 journal: "Environmental Research" - id: "4" url: "https://ntp.niehs.nih.gov/whatwestudy/topics/cellphones" title: "Cell Phone Radio Frequency Radiation" authors: "National Toxicology Program" year: 2018 journal: "NTP" --- If you've read [What the Science Says](/emf/what-the-science-says), you know the evidence on RF-EMF health effects is genuinely uncertain. You don't need to be worried, but if you want to reduce exposure with zero cost and no lifestyle disruption, here are the most evidence-informed approaches. ## Distance Is Your Friend This is the single most important principle. RF exposure follows the **inverse square law** — double your distance from the source and exposure drops to one quarter [1]. This has several practical implications: - **Use speakerphone or wired headphones** for calls instead of holding the phone to your head. Even a few inches makes a meaningful difference. - **Don't carry your phone in your pocket against your body** if you can avoid it. A bag, desk, or jacket pocket adds distance. Most phone manufacturers actually include fine-print advice about maintaining a small separation distance. - **WiFi router placement:** put your router in a central location for good coverage, but not right next to where someone sits or sleeps for hours. A few feet of distance reduces exposure substantially while maintaining signal quality [2]. ## Sleep Hygiene Overlap Put your phone on **airplane mode at night**, or better yet, charge it in another room. Even if you're not concerned about EMF, this removes the temptation to check notifications, eliminates notification sounds and screen flashes, and removes a source of blue light. See our Sleep page — removing devices from the bedroom helps sleep regardless of EMF concerns. ## Wired vs. Wireless **Wired headphones** eliminate RF exposure to your head during calls. Bluetooth headphones emit very low power RF (typically 1-2.5 milliwatts, compared to up to 2 watts from a cell phone), so the difference between Bluetooth earbuds and a phone held to your head is already enormous [1]. If Bluetooth convenience matters to you, the exposure is orders of magnitude lower than from the phone itself. Don't lose sleep over your AirPods. ## Who Might Want to Be More Cautious While no definitive harm has been established at normal exposure levels, the precautionary principle suggests certain groups might want to be more conservative: - **Children** — smaller heads, thinner skulls, developing nervous systems, and a lifetime of exposure ahead. The WHO recommends further research specifically on children and RF exposure [1]. Limiting recreational screen time (which health agencies recommend anyway) naturally reduces exposure. - **Pregnant women** — out of general precaution during a critical developmental period. Simple measures like not resting a laptop or phone on the abdomen are easy enough. These aren't panic-level recommendations. They're the same logic as "don't drink alcohol during pregnancy" — when the stakes involve development and the precaution is free, why not? ## What You Can Skip Some EMF-related products and practices aren't well supported: **"Dirty electricity" filters** — the concept that high-frequency voltage transients on home wiring cause health problems is controversial and lacks strong evidence. Some people report feeling better after installing filters, but controlled studies haven't confirmed a mechanism [3]. **EMF meters** — these can accurately measure field strength, but without knowing what level is meaningful for health, the numbers don't tell you much actionable. They can also cause anxiety — you'll find RF everywhere because it is everywhere. **EMF-blocking phone cases, stickers, and pendants** — most of these either don't work as claimed, or they force your phone to increase its transmission power to maintain signal (potentially increasing exposure). The FCC has warned about some of these products. ## The Bottom Line The precautions worth taking are the ones that cost nothing and improve your life in other ways: phone out of the bedroom improves sleep, speakerphone frees your hands, not carrying your phone in your pocket means you're less tethered to it. These are good habits even if RF exposure turns out to be completely harmless [4]. What you shouldn't do is spend money on shielding products, live in anxiety about WiFi, or avoid beneficial technology. The risk, if any, is small — and the precautions that make sense are small too.