5G marketing promises spectacular download speeds and ultra-low latency. Reality is different. Phones support 5G but often lack the mmWave radio frequencies that enable those headline numbers. Coverage remains sparse where it exists at all. And the sub-6 frequencies that work reliably indoors don't deliver the promised performance. Understanding what 5G actually offers requires separating hype from the underlying technology.
How 5G Actually Works
Cellular networks operate in frequency blocks labeled B1, B3, n78, and so on. Lower frequencies penetrate walls more easily but carry less data. Higher frequencies carry more data but struggle with obstacles. The same band behaves differently depending on network engineering and device capabilities.
Think of it like car engines: displacement doesn't automatically determine power. Implementation matters enormously. 4G networks promised 300 Mbps but typically deliver 10-15 Mbps. 3G manages 1-2 Mbps. 5G follows a similar pattern—maximum theoretical performance exceeds what you'll see in practice.
Sub-6 Versus mmWave
| Factor | Sub-6 | mmWave |
|---|---|---|
| Frequency | Below 6 GHz | Above 30 GHz |
| Indoor coverage | Solid signal | Struggles with glass and walls |
| Range | Covers entire neighborhoods | Limited to WiFi-router distances |
| Speed | Moderate | Very high |
| Infrastructure cost | Lower | Higher |
Sub-6 operates in the 3.3-3.8 GHz range, providing reliable indoor coverage. A single tower can serve an entire neighborhood. MmWave operates above 30 GHz, enabling impressive speeds but with severe range limitations—the signal covers about as much ground as a home WiFi router.
Most countries outside the U.S. Focus on sub-6 deployment. Regulatory bodies face ongoing challenges with mmWave spectrum that also serves military and satellite communications. Until these allocation issues resolve, the headline gigabit speeds remain a distant target.
What This Means for Phone Buyers
Phones like the OnePlus 9 support the n78 band, which India, Europe, and much of Asia are allocating for 5G use. Adding mmWave hardware would require extra space inside the device and increase costs—without offering tangible benefit where mmWave infrastructure doesn't exist.
The practical advantage of sub-6 5G is real: faster, more stable connections in congested areas compared to 4G. You're not missing the spectacular speeds shown in controlled demonstrations, because those require infrastructure that doesn't exist where you actually use your phone.
Our Analysis
5G follows a familiar pattern in technology marketing: showcasing maximum theoretical capability rather than realistic user experience. The demonstrations are technically accurate, but they apply to controlled environments with specific hardware—a narrow slice of actual usage.
For readers evaluating phones, focus on which 5G bands the device supports rather than whether it supports "5G" generically. If your carrier offers sub-6 service, a sub-6 phone delivers the practical benefit. If your carrier is building mmWave networks, you need mmWave hardware—but first verify that coverage exists where you actually use your phone.
The boring truth is that 5G's most reliable near-term benefit is network efficiency: more devices per tower, reduced congestion, and more stable connections in crowded areas. That's valuable—just not as photogenic as the marketing demos.
What to Watch Next
Watch for mmWave infrastructure announcements in your region. Until coverage becomes dense, most users won't experience headline speeds. Also monitor spectrum auction results and regulatory decisions that determine which bands become available for 5G in your country.
Key takeaways
- Most 5G users will access sub-6 networks offering solid indoor coverage but moderate speeds
- MmWave enables very high speeds but requires infrastructure that remains limited globally
- Phone buyers should verify which 5G bands are supported and whether their carrier has deployed those bands
- The practical near-term benefit of 5G is network efficiency, not maximum speed
Frequently asked questions
What's the difference between sub-6 and mmWave 5G?
Sub-6 operates below 6 GHz, providing solid indoor coverage with moderate speeds. MmWave operates above 30 GHz, enabling very high speeds but with limited range and poor wall penetration.
Why don't most phones have mmWave support?
MmWave requires additional hardware that takes up space and increases cost. Without mmWave infrastructure in most regions, the added expense and size provide little practical benefit.
Will I get gigabit speeds on 5G?
Only if mmWave infrastructure exists where you use your phone. Sub-6 5G offers faster connections than 4G but typically far below gigabit speeds.
Should I wait to buy a 5G phone?
If sub-6 5G is available from your carrier, a 5G phone offers immediate benefits in congested areas. The technology is mature enough for practical use despite marketing hype about maximum speeds.
What countries are deploying mmWave?
The U.S. Has the most mmWave deployment, though coverage remains limited. Most European and Asian countries focus on sub-6 infrastructure.