Every smartphone on the market emits radiofrequency (RF) energy, but not all phones emit the same amount. If you've ever wondered exactly how much radiation your specific phone gives off, the answer is public — you just need to know where to look.
What Is SAR?
Specific Absorption Rate, or SAR, measures how much RF energy your body tissue absorbs when using a phone at maximum transmission power, expressed in watts per kilogram (W/kg). In the United States, the FCC caps SAR at 1.6 W/kg averaged over one gram of tissue; the EU and most other countries use the ICNIRP limit of 2.0 W/kg averaged over ten grams of tissue. Every phone sold legally must test below these thresholds before it can reach the market.
How to Find Your Phone's SAR Rating
● Dial *#07# on many Android phones to pull up SAR information directly
● Search the FCC ID (usually printed in Settings > About Phone, or on the box/manual) at fcc.gov/oet/ea/fccid
● Check the manufacturer's support page, which is required to publish SAR values
● Search "[your phone model] SAR rating" for a quick reference, then verify against the FCC database
Why SAR Isn't the Whole Story
A lower SAR number doesn't automatically mean lower real-world exposure. SAR is measured at maximum power output under lab conditions, but your actual exposure depends heavily on how you use the phone day to day. Signal strength matters — a phone in a low-coverage area works harder and transmits at higher power to maintain connection. Distance from your body matters even more, since RF intensity drops off quickly over just a few centimeters. Call duration, data usage, and even the phone case you use can all shift your real exposure up or down.
Factors That Increase Real-World Exposure
● Weak cell signal, which forces the phone to boost transmission power
● Holding the phone directly against your head during calls
● Keeping the phone in a pocket or bra for extended periods
● Streaming or downloading large files, which increases active transmission time
● Using the phone in a moving vehicle, where it repeatedly reconnects to new towers
Lowering Your Actual Exposure
Since SAR is fixed by the manufacturer, the more practical lever is reducing how much and how closely you're exposed day to day — using speakerphone or headphones, keeping distance when not actively using the device, and relying on WiFi calling where signal is strong.
The Bottom Line
SAR gives you a standardized starting point, but your habits determine your actual exposure far more than the number on the label. For the bigger picture on whether this level of exposure is something to worry about, read "Is Phone Radiation Dangerous?", or check out our phone-specific EMF protection accessories.