If you dig an iPhone 4 or iPhone 4S out of a drawer, charge it with that gloriously chunky 30-pin cable, and look at its old cellular specifications, you may run into a surprisingly confusing question: Are the iPhone 4 and iPhone 4S 4G phones?
The short answer is simple for the iPhone 4: no, the iPhone 4 is a 3G phone and does not support 4G LTE. The iPhone 4S is more complicated. It also lacks LTE, but its faster HSPA/HSPA+ cellular connection was marketed as “4G” by AT&T, and some AT&T iPhone 4S models actually displayed a 4G icon after an iOS update.
That little icon caused more confusion than a family group chat trying to choose a restaurant.
Technically, neither the iPhone 4 nor iPhone 4S supports the LTE technology most people eventually came to associate with 4G smartphones. However, the iPhone 4S could achieve substantially faster 3G-family data speeds than the iPhone 4, which explains why American carriers sometimes placed it under the broad 4G marketing umbrella.
Quick Answer: iPhone 4 vs. iPhone 4S 4G Support
| Feature | iPhone 4 | iPhone 4S |
|---|---|---|
| Released | 2010 | 2011 |
| Traditional 3G | Yes | Yes |
| HSDPA | Yes, up to 7.2 Mbps | Yes, up to 14.4 Mbps |
| HSPA/HSPA+ | Limited 3G-family support | Yes, faster HSPA-family service |
| AT&T “4G” marketing | Generally no | Yes |
| 4G LTE | No | No |
| Modern 4G phone? | No | No |
Why the Definition of “4G” Became So Confusing
To understand the iPhone 4S controversy, it helps to remember that mobile network terminology was unusually messy in the early 2010s.
Consumers originally had relatively clear categories. There was 2G, followed by 3G, and eventually there would be 4G. Easy enough.
Then carriers discovered marketing departments.
Technologies such as HSPA and HSPA+ dramatically improved the performance of existing UMTS 3G networks. Meanwhile, LTE and WiMAX represented newer network architectures capable of even higher speeds. In the United States, carriers began calling several of these technologies “4G,” even though they were not technically identical.
AT&T and T-Mobile, for example, marketed upgraded HSPA+ networks as 4G. Verizon aggressively promoted LTE as 4G LTE. Sprint promoted WiMAX before later moving toward LTE.
Consequently, a phone could be described as having “4G speeds” without containing an LTE modem.
This distinction is exactly where the iPhone 4S enters the story.
Is the iPhone 4 a 4G Phone?
No. The iPhone 4 does not support 4G LTE.
Apple released the GSM iPhone 4 in 2010, followed by a CDMA version for Verizon. Depending on the model and carrier, the phone supported technologies including GSM, EDGE, UMTS, HSDPA, HSUPA, CDMA, and EV-DO Rev. A.
iPhone 4 GSM Network Support
The GSM version supported UMTS/HSDPA/HSUPA across several frequency bands. Its HSDPA connection could theoretically reach approximately 7.2 Mbps downstream under ideal conditions.
That was quite respectable in 2010. Today, downloading a modern app at those speeds might provide enough time to contemplate several major life decisions.
Nevertheless, HSDPA at those specifications remained part of the 3G technology family.
Verizon’s CDMA iPhone 4
The Verizon version of the iPhone 4 used CDMA EV-DO Rev. A for mobile data. That was also considered 3G technology.
Most importantly, neither version contained an LTE modem.
So even though advertisements during that era were increasingly filled with enormous glowing “4G” logos, the iPhone 4 itself was not an LTE-capable 4G smartphone.
Is the iPhone 4S a 4G Phone?
Here we need two answers.
In AT&T’s historical marketing terminology, the iPhone 4S could be called a 4G phone because it accessed the carrier’s faster HSPA/HSPA+ network.
In the sense most consumers now mean when they say 4G4G LTEthe iPhone 4S is not a 4G phone.
Apple released the iPhone 4S in October 2011 with a substantially improved cellular radio. On compatible GSM networks, it supported HSDPA download rates of up to 14.4 Mbps and HSUPA uploads of up to 5.76 Mbps.
That was roughly double the theoretical HSDPA download capability of the GSM iPhone 4.
Apple emphasized that the device offered much faster downloads and performance comparable to some smartphones that competitors were already advertising as 4G devices.
But Apple did not give the iPhone 4S an LTE modem.
The iPhone 4S Was Also a “World Phone”
Another major cellular improvement was its ability to support both GSM/UMTS and CDMA technologies in one hardware design.
The iPhone 4 had separate GSM and CDMA variants. The iPhone 4S combined broader network capabilities, allowing certain carrier customers to roam internationally on GSM networks.
That was a meaningful upgrade, but being a world phone had nothing to do with LTE support.
Why Did Some iPhone 4S Phones Say “4G”?
This is probably the biggest reason people still ask whether the iPhone 4S supports 4G.
When Apple released iOS 5.1 in March 2012, AT&T customers with an iPhone 4S began seeing a 4G indicator where the phone had previously displayed 3G.
No mysterious LTE component appeared inside the phone overnight. Apple did not sneak into bedrooms around America and solder new modems into sleeping iPhones.
The hardware remained the same.
The change reflected AT&T’s classification of its HSPA/HSPA+ network as 4G. The software simply changed the network label shown to users when connected to qualifying AT&T service.
This explains the seemingly contradictory experiences people remember:
- One iPhone 4S owner remembers clearly seeing “4G.”
- Another insists the iPhone 4S never supported LTE.
- Both people can be correct.
The first person is describing the carrier label. The second is describing the radio technology.
HSPA+ vs. LTE: What’s the Difference?
HSPA+ evolved from UMTS/WCDMA 3G infrastructure. It improved data rates through enhancements to the existing HSPA technology family.
LTE, or Long Term Evolution, represented a more substantial transition toward a new mobile broadband architecture. Among other advantages, LTE generally provided better capacity, lower latency, and significantly greater opportunities for higher data speeds.
The iPhone 4S topped out at a theoretical HSDPA download rate of 14.4 Mbps. Real-world testing at the time often produced considerably lower speeds, although under favorable AT&T conditions the 4S could approach roughly 10 Mbps.
Early LTE devices could considerably exceed those speeds under good network conditions.
This is why calling every HSPA+ connection identical to LTE was an oversimplification, even though both were marketed as 4G during that period.
Did Apple Call the iPhone 4S a 4G Phone?
Apple took a more cautious approach than some carriers.
At the iPhone 4S introduction, Apple highlighted its 14.4 Mbps maximum download capability and compared its performance with smartphones being sold as 4G devices. Apple focused heavily on 4G-like performance rather than presenting the handset as an LTE device.
This distinction mattered because AT&T already had phones carrying names such as “4G” while using HSPA-family technology.
Later, Apple allowed AT&T’s network indicator to display “4G,” further muddying the distinction for consumers.
Which Was the First 4G LTE iPhone?
The breakthrough arrived with the iPhone 5 in 2012.
The iPhone 5 introduced LTE support to Apple’s smartphone lineup. That is the clean historical dividing line for shoppers wondering which older iPhones truly connected to LTE networks.
- iPhone 4: No LTE.
- iPhone 4S: No LTE.
- iPhone 5: LTE support introduced.
It is one of the easiest ways to remember the answer.
If the model number starts with four, LTE is not coming through the door.
Was the iPhone 4S Much Faster Than the iPhone 4?
On the right GSM network, yes.
The iPhone 4’s HSDPA radio supported a theoretical maximum download rate around 7.2 Mbps. The iPhone 4S increased that figure to 14.4 Mbps.
Contemporary technical testing found that an AT&T iPhone 4 might reach around 6 Mbps under excellent conditions while an iPhone 4S could approach 9 to 10 Mbps in favorable circumstances.
Actual performance depended on signal strength, congestion, carrier infrastructure, location, network backhaul, and plenty of other variables that have been frustrating smartphone owners since approximately five minutes after mobile data was invented.
Verizon and Sprint versions were different. Because they relied on EV-DO Rev. A for domestic cellular data, they did not receive the same dramatic download-speed increase offered by the 4S on AT&T’s upgraded HSPA network.
Can the iPhone 4 or iPhone 4S Use Today’s 4G Networks?
No. Neither phone contains the LTE radio hardware necessary to connect to modern 4G LTE networks.
This is not something that can be fixed with an iOS update, carrier settings file, jailbreak, SIM card, or particularly enthusiastic visit to the Settings app.
Cellular technologies require compatible modem hardware and supported radio frequency bands. Software cannot transform a 3G modem into an LTE modem.
The situation has become even more restrictive because major U.S. carriers retired their legacy 3G networks during 2022. AT&T shut down its 3G network, T-Mobile retired its older UMTS network, and Verizon completed the retirement of its CDMA network around the end of that year.
As a result, an old iPhone 4 or iPhone 4S should now be regarded mainly as a Wi-Fi device, collector’s item, nostalgia machine, music player, or museum exhibit demonstrating an era when a 3.5-inch screen was considered completely normal.
Common Questions About iPhone 4 and iPhone 4S Network Support
Does the iPhone 4 support LTE?
No. No version of the iPhone 4 includes LTE connectivity.
Does the iPhone 4S support LTE?
No. Although AT&T marketed compatible HSPA/HSPA+ service as 4G, the iPhone 4S does not contain an LTE modem.
Why does an old iPhone 4S sometimes show 4G?
AT&T classified its faster HSPA/HSPA+ network as 4G. Beginning with iOS 5.1, compatible AT&T iPhone 4S devices could display a 4G network indicator.
Can an iPhone 4S be upgraded to 4G LTE?
No. LTE requires different radio hardware. Updating iOS cannot add LTE support.
Was the iPhone 4S faster than the iPhone 4?
Yes, particularly on GSM/UMTS networks such as AT&T’s network at the time. Its maximum HSDPA download rate increased from approximately 7.2 Mbps on the iPhone 4 to 14.4 Mbps on the iPhone 4S.
What was the first LTE iPhone?
The iPhone 5, introduced in 2012, was Apple’s first iPhone with LTE support.
Real-World Experience: What Using the iPhone 4 and 4S Felt Like During the “4G” Era
Looking purely at specification sheets can make the difference between 7.2 Mbps and 14.4 Mbps seem like a simple numbers exercise. In actual use, the transition from the iPhone 4 to the iPhone 4S could feel much more significantassuming you were on the right carrier in the right location.
Imagine using an AT&T iPhone 4 in 2011. A reasonably strong HSPA connection was perfectly capable of loading mobile websites, downloading email, checking Facebook, navigating with Maps, and streaming lower-resolution video. Compared with EDGE, it felt wonderfully fast.
Then you moved to an iPhone 4S in an area where AT&T had upgraded its network and backhaul. Websites could appear noticeably quicker. App downloads felt less tedious. Photos uploaded sooner. Streaming required less staring at a spinning loading indicator while silently questioning your carrier contract.
It still wasn’t LTE.
That became obvious if you placed the 4S next to one of the emerging LTE smartphones in an area with strong LTE coverage. LTE’s higher throughput and lower latency could make web pages and downloads feel substantially more immediate.
The Status-Bar Experience Was Especially Strange
The arrival of the 4G indicator on AT&T’s iPhone 4S produced one of the more memorable quirks of early smartphone marketing.
A user could install an iOS update, restart the same phone, connect to essentially the same type of radio network, and suddenly discover that “3G” had become “4G.”
Nothing physical inside the phone had changed.
For ordinary users, however, the status bar was naturally more convincing than a telecommunications standards document. If your iPhone said 4G, why wouldn’t you assume you owned a 4G phone?
That experience illustrates why the iPhone 4S question survives years later. Consumers were not imagining the label. The label really existed. It simply represented a broader carrier definition of 4G rather than LTE capability.
Carrier Choice Changed the Experience
An AT&T iPhone 4S could take advantage of faster HSPA-family data rates. A Verizon or Sprint iPhone 4S generally relied on EV-DO Rev. A for domestic cellular data, making its network experience much closer to older 3G performance.
That meant two people could buy the same basic iPhone 4S and have dramatically different opinions about whether its cellular upgrade mattered.
The AT&T customer might rave about faster downloads.
The Verizon customer might shrug and say, “Siri is nice.”
Coverage also mattered enormously. A theoretical 14.4 Mbps specification meant very little if you were inside a building with weak reception or sharing a congested cell tower with thousands of other users.
Using One Today Is a Completely Different Experience
Trying an iPhone 4 or 4S today is less an exercise in evaluating network speed and more an exercise in digital archaeology.
Many current websites and apps are designed for much newer versions of iOS. Modern security requirements can create compatibility problems. Current apps may no longer install. And U.S. 3G network shutdowns removed the cellular infrastructure these phones originally depended upon.
Wi-Fi can still make an operational handset interesting for offline music, old games, photos, alarms, or simply exploring classic versions of iOS. Collectors may particularly appreciate an iPhone running period-correct software.
But buying one because a listing describes the iPhone 4S as a “4G phone” would be a mistake. Historical carrier terminology does not make it compatible with today’s LTE networks.
The Lesson for Modern Smartphone Buyers
The iPhone 4S story also offers a useful lesson that remains relevant today: network labels do not always tell the entire technical story.
Terms such as 4G, 4G LTE, LTE Advanced, 5G, 5G UC, 5G UW, and 5G+ can represent different combinations of technology and carrier branding.
When compatibility matters, check the actual cellular technologies and frequency bands supported by the device rather than relying exclusively on whatever tiny letters appear next to the signal bars.
The specification sheet may be less exciting than the marketing brochure, but it is considerably less likely to wear a tiny cape and exaggerate.
Conclusion: So, Are the iPhone 4 and iPhone 4S Really 4G Phones?
The iPhone 4 is not a 4G phone. It supports 3G technologies such as HSDPA or EV-DO depending on the model, but it has no LTE connectivity.
The iPhone 4S is technically more complicated but still does not support 4G LTE. Its faster HSDPA/HSPA-family connection could reach a theoretical 14.4 Mbps, and AT&T marketed that network as 4G. This is why certain AT&T iPhone 4S devices displayed a 4G icon after the iOS 5.1 update.
If by “4G phone” you mean a handset that supports LTEthe definition most people ultimately adoptedthe answer is therefore no for both the iPhone 4 and iPhone 4S.
Apple did not add LTE connectivity until the iPhone 5 in 2012.
So if an old iPhone 4S insists it once lived the 4G lifestyle, don’t argue too aggressively. It has historical evidence. Just don’t hand it a modern LTE SIM and expect miracles.
Note: Network terminology in this article distinguishes historical U.S. carrier marketing from LTE hardware capability. An old “4G” status indicator on an iPhone 4S does not mean the device supports modern 4G LTE networks.
