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Introduction: frequencies as a limited resource

Radio frequencies are a limited natural resource. Mobile signals are transmitted using electromagnetic waves of specific frequencies (or frequency ranges). Since the spectrum is finite, it is important to allocate these frequencies efficiently among various users and services (including telecommunications companies). This process is managed by national regulatory authorities.

Mobile devices (smartphones, modems, etc.) do not “consume all frequencies indiscriminately”: they can only operate within the frequency ranges supported by their radio modules. If an operator uses a frequency that a device does not support, the connection will not work.

International standards and the role of 3GPP

Standardization bodies — primarily the 3rd Generation Partnership Project (3GPP) — develop technical specifications for mobile communications (GSM, UMTS, LTE, 5G NR, and others).

The 3GPP specifications define the permissible frequency ranges, operating modes (FDD, TDD, etc.), and methods of frequency separation (uplink / downlink). If an operator tries to use a frequency not included in these specifications, devices compliant with the standards will not be able to operate on that network.

At a higher level, the International Telecommunication Union (ITU) also participates in spectrum allocation and cross-border coordination to minimize interference.

Why frequency ranges differ across countries

Historical reasons and regulation
Different countries, at various stages of telecommunications development, have already allocated certain frequencies to other services (radio, television, amateur radio, etc.). When it becomes necessary to “free” spectrum for mobile communication, regulators must either reassign adjacent bands or negotiate with existing services.

Different standards and technologies
Different regions may have deployed different mobile communication technologies (GSM, CDMA, LTE, 5G, etc.), which affected preferred frequency allocations.

Regional regulation and coordination
To avoid cross-border interference, countries often coordinate spectrum usage in border areas. In addition, within regions (for example, the European Union), “harmonized” frequency bands common to all member states may be established.

Physical properties of radio waves
Lower frequencies (e.g., hundreds of megahertz) have better penetration through walls, longer range, but lower data transfer speeds (due to limited bandwidth). Higher frequencies (several gigahertz and above) provide greater throughput but worse penetration and smaller coverage areas. Therefore, the optimal combination of frequency bands varies depending on building density, subscriber distribution, and required speed and coverage.

Main frequency ranges used in mobile communication

Below is an overview of key frequency ranges (in megahertz and above) used across different generations of mobile networks.

GSM / 2G

GSM (2G) is still used in many countries as a backup and for providing basic services (SMS, voice). Main frequency ranges:

• 900 MHz (EGSM / GSM-900) — widely used in Europe, Asia, and Africa
• 1800 MHz (GSM-1800 / DCS) — also very common
• In the Americas — 850 MHz and 1900 MHz (GSM-850, GSM-1900)

These bands became the “universal” standard for voice and fallback communication services.

UMTS / 3G

3G (UMTS) also has standardized frequency ranges:

• Most commonly, around 2100 MHz (UMTS Band 1)
• Also — 850, 900, 1700, 1900 MHz depending on the region

Since 3G networks were often deployed after GSM, some frequency ranges overlap with existing GSM allocations, requiring coordination.

LTE / 4G and transition to 5G

For LTE (4G), the spectrum was greatly expanded. In 3GPP specifications, numerous bands are defined (FDD, TDD) covering hundreds of megahertz up to several gigahertz.

• Frequencies around 700–900 MHz (low band) — for wide coverage areas
• Ranges in 1800, 2100, and 2600 MHz
• Also, the C-band (approximately 3400–3800 MHz) — often used for 5G and new LTE networks as the primary “mid-band” in Europe

Carrier aggregation is widely used — when a device can simultaneously combine multiple spectrum blocks to increase throughput.

5G NR (New Radio)

In 5G standards (NR), frequency bands are divided into FR1 (frequencies below approximately 7 GHz) and FR2 (millimeter-wave frequencies, above 24 GHz).

• FR1 band (e.g., 600 MHz to several GHz) — provides wide coverage and stability
• FR2 band (millimeter waves) — provides extremely high speeds but short range and poor penetration through obstacles

Additionally, in the latest standard releases (Release 18), specific frequency ranges have been added for non-terrestrial networks (satellite / aerial — NTN).

Why your device may not work with a foreign operator

When traveling abroad with your smartphone, you may encounter the following issues:

• The local operator uses a frequency band not supported by your device.
• Your device may support the main bands but not all supplementary ones (for example, higher-frequency or additional downlink bands).
• Even if frequencies match, incompatibilities in duplex mode (FDD vs. TDD) or channel width may occur.

Therefore, when purchasing a smartphone, manufacturers often specify a list of supported frequency bands. It is important to verify that these bands cover the frequencies used in your country and by your intended operators.

Conclusion

Radio frequencies are a scarce resource allocated by governments and coordinated internationally.

The 3GPP standards define the permissible frequency ranges for mobile communication. Operators must operate within these standards if they want devices to connect properly.

Different regions use different frequencies for historical, technical, and regulatory reasons.

A device must support the specific bands used by the operator; otherwise, the connection may not be possible.

Although LTE networks are marketed by mobile operators and device manufacturers as belonging to the fourth generation (4G), this standard does not meet the requirements of the International Telecommunication Union (ITU) for 4G networks and is not officially recognized as such.

Theoretically, LTE can provide speeds up to 326 Mbps, while the real mobile Internet speed may reach 100 Mbps. Note that the actual speed strongly depends on signal quality and base station load, so the average speed is usually several times lower.

LTE is a natural evolution for operators with GSM/UMTS networks as well as for those with CDMA2000 networks. Different countries use different LTE frequencies and bands, which means that only multiband phones can connect to LTE networks worldwide.

The main technological limitation of the LTE standard is the inability to make voice calls natively. The first solution to this problem was the CFSB technology, which, upon an outgoing or incoming call, simply reverts the subscriber to legacy networks — GSM or UMTS. This method provides voice service in most LTE networks in Russia. The disadvantage is a noticeable delay during call setup between subscribers.

Another technology for maintaining voice transmission in LTE networks is called VoLTE. The voice is transmitted as IP packets and does not require switching to older-generation networks. However, both the mobile operator and the device must support VoLTE. Most popular mid-range and flagship smartphones now include this feature. In Russia, VoLTE is partially supported by all major national operators.

Definition of a Band

In mobile communications, a “band” refers to a standardized range of radio frequencies defined by 3GPP and other specifications, within which data and voice transmission occur. A band is not just a “piece of spectrum” — it represents an entire configuration of parameters that ensure proper network operation and device compatibility.

In simpler terms, a band is a “set of frequencies and operating modes” standardized so that different devices and operators can communicate effectively.

Key parameters that define a band

Each band is described by a set of parameters that operators and equipment manufacturers must follow. The main ones include:

These parameters guarantee that the base station and the user device (smartphone, modem) can “negotiate” the exact frequency, channel width, and transmission mode.

FDD vs TDD: two ways a band operates

The duplex type is one of the key characteristics of a band.

FDD (Frequency Division Duplex)

• In FDD, uplink and downlink are transmitted on different frequencies simultaneously.
• Advantages: stable operation, minimal synchronization requirements, possible symmetric bandwidth.
• Disadvantage: requires paired frequencies, which consume more spectrum.
• FDD bands define a specific duplex spacing between uplink and downlink and require filtering to prevent mutual interference.

TDD (Time Division Duplex)

• In TDD, the same frequency range is used — uplink and downlink alternate over time (time slots).
• Advantages: no need for paired frequencies, flexibility (time allocation between transmission and reception can be adjusted).
• Disadvantage: requires high synchronization accuracy; more difficult to prevent interference between base stations.

Some bands are purely TDD, others FDD, and some may operate in hybrid modes (e.g., SDL — Supplemental Downlink, an additional downlink-only channel).

How bands work in practice

Each operator, through government-issued licenses, is assigned one or more bands with defined frequency ranges and operating conditions.

The base station (cell tower) is configured for that band: it transmits and receives signals on the designated frequencies.

The user device (smartphone, modem) must support that band — i.e., it must be able to operate on those frequencies and duplex modes (FDD / TDD) with the permitted channel bandwidths.

Through carrier aggregation, an operator can combine several bands — either within one or across multiple — to increase data rates. For example, LTE supports aggregation of up to five component carriers (CCs) with different channel widths (5, 10, 15, 20 MHz).

Main LTE bands table

Below is a simplified table of the main LTE (4G) bands standardized by 3GPP. The table lists frequency ranges, duplex mode, and notes. Please note that not all bands are commercially used in every country.

LTE-A, LTE, HSUPA, 3G, 4G, UMTS, GSM, WCDMA