Cellular & 5G Technology

1G through 5G evolution. Sub-6 GHz vs mmWave physics, SAR regulations, and evidence-based health analysis.

Cellular Generations

Gen	Era	Technology	Max Speed	Frequency	Cell Size
1G	1979-1991	AMPS (analog)	2.4 kbps	800 MHz	2-20 km
2G	1991-2003	GSM / CDMA	64 kbps (GPRS: 114 kbps, EDGE: 384 kbps)	900/1800/1900 MHz	2-20 km
3G	2001-2012	UMTS / CDMA2000 / HSPA+	2 Mbps (HSPA+: 42 Mbps)	850/900/1700/1900/2100 MHz	1-10 km
4G LTE	2009-present	LTE / LTE-Advanced / LTE-A Pro	100 Mbps (LTE-A: 1 Gbps theoretical)	600 MHz - 3.5 GHz	1-10 km
5G	2019-present	NR (New Radio)	10-20 Gbps theoretical	600 MHz - 39 GHz (sub-6 + mmWave)	0.1-10 km (varies by band)

5G Frequency Bands

Speed	Range	Penetration
50-250 Mbps	5-10+ km	Excellent (same as 4G)
100-900 Mbps	1-5 km	Good
1-4+ Gbps	100-300m	Poor (blocked by walls, glass, rain, foliage)

SAR Safety Limits

FCC (USA):

ICNIRP (EU):

Inverse Square Law

Radio signal power decreases with the square of distance. Double the distance = 1/4 the power. Triple = 1/9. At 10x the distance, power is 1/100th.

Health Claims Examined

Cell phone use at normal levels does not cause brain cancer

Verdict:

The Danish Cohort study (420,000+ subscribers, 20+ year follow-up), the Interphone study (13 countries), and the UK Million Women Study all found no increased risk. Brain cancer incidence rates have remained flat despite billions of phone users since the 1990s.

RF fields are classified as "possibly carcinogenic" (IARC Group 2B)

Verdict:

This is the correct IARC classification (2011). However, Group 2B means "limited evidence" - the same category as pickled vegetables, talcum powder, and aloe vera extract. It indicates uncertainty, not confirmed risk.

5G mmWave is more dangerous than previous generations

Verdict:

mmWave (24-39 GHz) is absorbed by the outer skin layer (penetration depth <1mm) and cannot reach internal organs. Power levels for 5G small cells are lower than macro cell towers. No peer-reviewed evidence supports increased risk from mmWave at exposure levels permitted by regulation.

Very high, prolonged occupational RF exposure may pose health risks

Verdict:

The NTP study (2018) found increased tumor rates in male rats exposed to 2G/3G signals at 1.5-6 W/kg whole-body SAR for 2 years (9 hours/day) - levels far exceeding any consumer exposure. The Ramazzini Institute found similar results at lower levels, though methodological concerns exist. These studies suggest a possible risk at extreme exposures but do not apply to normal phone use.

Cell towers in neighborhoods pose a cancer risk

Verdict:

At typical distances (100m+), cell tower exposure is 1,000-100,000x below safety limits. Multiple systematic reviews find no association between residential proximity to cell towers and cancer. Your own phone against your head is a far greater source of RF exposure.