What Is 5G: A Complete Guide to the Fifth Generation of Mobile Networks

Every decade or so, mobile networks take a generational leap. 2G gave us SMS and the first data connections. 3G made mobile browsing possible. 4G LTE turned the smartphone into an always-connected pocket computer. 5G is the fifth generation, but unlike its predecessors it is not just about smartphones: it is a platform for connecting entire industries, healthcare, transportation, and the cities of the future.

What Is 5G: Definition and Standards

5G is an international standard for mobile communication networks, defined by the 3GPP (3rd Generation Partnership Project) organization in Release 15 and subsequent specifications. It is not a single product or a single technology: it is a set of specifications that define how devices and networks must communicate to guarantee certain performance levels.

The official promises of the 5G standard:

• Peak speeds up to 20 Gbps download
• Latency down to 1 ms in the most critical applications
• Density up to 1 million connected devices per km²
• 99.9999% reliability (six nines) for mission-critical applications

In everyday reality, these are maximum theoretical values. Typical speeds measured on 5G in Italy today are 200–800 Mbps download, with latencies of 10–30 ms — already significantly better than 4G, but far from the theoretical peaks.

How 5G Works: Key Technologies

The Three Frequency Bands

5G does not use a single frequency but three distinct ranges, each with different characteristics:

Sub-1 GHz (low band): frequencies below 1 GHz, the same used by 2G and 3G. Excellent coverage (hundreds of km from towers), outstanding building penetration. Modest speeds (50–200 Mbps). In Italy, ISPs use this band to guarantee coverage in rural areas and as a national baseline.

Sub-6 GHz (mid band, or "C band" around 3.5 GHz): the heart of 5G. Good coverage (a few km from towers), high speeds (200–800 Mbps real-world). This is the band on which the majority of Italian investment is focused. TIM, Vodafone, WINDTRE, and Iliad all received frequencies in this band at the 2018 auction.

mmWave (millimeter-wave, 24–100 GHz): very high frequencies, very limited coverage (a few hundred meters, blocked by walls, trees, and even heavy rain). But speeds that can exceed 4 Gbps and latency below 5 ms. In Italy present in very few places: some sports arenas, airports, trade fairs.

Massive MIMO and Beamforming

5G antennas are not like traditional towers that radiate the signal in all directions. They use arrays of hundreds of antennas (Massive MIMO — Multiple Input Multiple Output) working in coordination to:

• Beamforming: focus the signal toward each individual device like a beam of light, instead of wasting energy in all directions
• Spatial multiplexing: transmit to multiple devices simultaneously on the same channel using different spatial directions

The result is much more efficient use of radio spectrum: the same frequency serves many more users at higher speeds.

Network Slicing

One of 5G's most revolutionary innovations is the ability to create dedicated virtual networks (slices) on the same physical infrastructure. One slice for autonomous vehicles with guaranteed latency < 5 ms. One slice for mobile broadband with maximum bandwidth. One slice for IoT with minimum power and maximum device density.

Each slice can have different priorities, quality of service, and security settings, managed via software in real time — impossible with previous networks.

5G in Italy: Where Do We Stand?

According to AGCOM and operator data, at the end of 2024:

• More than 85% of the Italian population is covered by a 5G signal (mainly low and mid band)
• Major cities (Milan, Rome, Naples, Turin, Bologna) have comprehensive coverage including C band
• Rural and mountain areas are still predominantly 4G
• 5G devices sold in Italy exceed 60% of all new smartphones

The four national operators (TIM, Vodafone, WINDTRE, Iliad) are progressively shutting down 3G to reallocate frequencies to 5G, a process that will be completed by 2025–2026.

NSA vs SA: Two Different Architectures

Much of current 5G operates in NSA (Non-Standalone) mode: it uses the 4G network as an anchor for the control plane and adds 5G only for data. It is faster to deploy (reuses existing 4G infrastructure) but does not deliver the minimum latency of true 5G.

5G SA (Standalone) has a completely new core, enables full network slicing and ultra-low latency. Italian operators are progressively migrating toward SA, but full deployment will take several more years.

5G and Health: The Most Common Concerns

Concerns about 5G radio waves resurface periodically. The facts:

• 5G frequencies (including mmWave) are non-ionizing: they do not have enough energy to damage DNA or cause cellular mutations, unlike X-rays or UV radiation.
• The WHO, ICNIRP (International Commission on Non-Ionizing Radiation Protection), and Italy's Istituto Superiore di Sanità have found no evidence of health risk within recommended exposure limits.
• Italy has among the strictest electromagnetic field exposure limits in Europe (6 V/m vs the 61 V/m recommended by ICNIRP), set as a precautionary measure.

What Changes for the Average User?

For those who use their smartphone to browse, watch videos, and use apps, 5G brings:

• 4K streaming on mobile without buffering even in crowded places
• Faster movie and update downloads
• Video calls that are more stable and higher quality even with many people in the area
• Mobile gaming with latency comparable to fiber

The biggest impact, however, will be seen in industry: factories, hospitals, transportation, and smart city infrastructure over the next 5–10 years.

Measure Your 5G Network Speed

Want to see the real performance of your 5G connection (or compare it with your home fiber)?

👉 Run the speedtest on speedtest.it

The test measures download, upload, and latency using impartial servers not owned by ISPs — so you get a realistic result, not an optimized one.

Frequently Asked Questions

Do I need a new smartphone to use 5G? Yes. Smartphones made before 2020 do not support 5G. The majority of phones sold today in Italy include a 5G modem, even in the mid-price range (€200–400).

Will 5G replace home fiber? Potentially for many users, especially where fiber doesn't reach. FWA 5G (Fixed Wireless Access) uses 5G to bring internet home via an external antenna. In areas with good 5G coverage and no FTTH fiber, it can be a valid alternative.

How much does 5G cost in Italy? Not always more. Many ISPs include 5G in standard plans with no surcharge. Iliad, for example, offers 5G on almost all its plans at no extra cost.