RFU.World — Radio Frequency & U

01

Open your network info

Choose your phone and open its field-test screen. Hidden menus: because apparently bars were too emotionally straightforward.

Dial exactly

*3001#12345#*

Open the Phone app.
Enter the code and tap Call.
Open the LTE or 5G serving-cell information screen.
Take a screenshot that shows the signal values.

Try on many Android phones

*#*#4636#*#*

Common Samsung service code

*#0011#

Some carriers and models block engineering codes. If so, check Settings → About phone → SIM status / Network or the manufacturer’s diagnostic screen.

02

Feed RFU.World the screenshot

AI reads only the visible cellular metrics and builds the report. No crystal ball, no divining rod, tragically.

Choose or drop a screenshotPNG, JPG, HEIC if your browser can decode it

Privacy check: field-test screens can expose phone numbers and network identifiers. Crop anything you don’t want uploaded. RFU.World instructs the analyzer not to repeat phone numbers, IMSI, IMEI, serial numbers, or account details.

03

Your RFU report

Signal quality, network identifiers, spectrum position, wavelength, and mapping without pretending every number is a Geiger counter.

Signal quality

The three readings that matter most for cellular connection quality.

SCREENSHOT VALUES

Network details

What your phone is actually reporting.

What your connection means

What the quality means

Where your signal lives on the spectrum

Approximate band position and free-space wavelength.

Band unknown

Radio / UHF

Microwave

mmWave

0.1 GHz1 GHz10 GHz100 GHz

What the numbers can and cannot tell you

Signal measurements are useful. They are not the same thing as a personal RF exposure reading.

What RFU.World can show

RSRP: received cellular reference-signal power at the phone.
RSRQ / SINR: connection quality versus interference and noise.
Band / frequency: the approximate part of the RF spectrum in use.
TX power: only when the diagnostic screen explicitly exposes it.
Approximate cell distance: if a serving-cell record can be found.

What it cannot measure

Your actual SAR or absorbed RF dose.
Total RF power from every source around you.
A trustworthy personal exposure level from tower distance alone.
Health effects from a single network screenshot.

Map your serving cell

Compare your browser location with a crowdsourced estimate of the logical serving cell detected in the screenshot.

Optional

Nothing is shared until you press a map button.

Manual tower coordinates

Latitude Longitude

Cell databases contain estimated logical cell positions, not guaranteed physical tower sites. Several sectors can share one physical structure. Nearby-cell lookup sends an approximate bounding box around your browser location to the configured database.

Reality check: RFU.World is an educational network decoder, not a calibrated RF meter or medical tool. RSRP, RSRQ, SINR, transmit power, and tower distance are not interchangeable with SAR or absorbed RF dose.