Galaxy Fit4 Release Date: What the FCC Filing Reveals and How It Compares to the Fit3
Key takeaways
- Samsung hasn’t announced the Galaxy Fit4, but model SM-R391 (“FIT4”) cleared the FCC in August 2026.
- Known changes are small: Bluetooth 5.4 and a similar design; GPS and NFC are unconfirmed.
- A late-2026 reveal is possible but unofficial; Fit3 owners have little reason to rush.
There was talk of a September launch, but as of late September 2026 Samsung still hasn’t announced the Galaxy Fit4. If you held off on buying a Fit3 to wait for it, the Galaxy Fit4 release date is probably the question on your mind right now.
Development hasn’t stalled. A model numbered SM-R391 has shown up in a US FCC filing, so launch preparations are clearly still moving.
Why the September launch rumor missed
Talk of a September Galaxy Fit4 launch started with overseas tech reports in June. The band didn’t appear at Galaxy Unpacked in July, and predictions shifted to a reveal alongside the Galaxy S26 FE.
That’s not how the schedule played out. The Galaxy S26 FE was announced on its own in late August and went on sale in early September, with no Fit4 next to it. The rumored September joint launch simply didn’t happen.
The product hasn’t disappeared, though. In August, a Samsung wearable with the model number SM-R391 was registered with the US Federal Communications Commission (FCC), and the related documents use the name FIT4.
The Galaxy Fit3’s model number was SM-R390, so the new device is fairly clearly its successor.
What the FCC filing reveals about the Galaxy Fit4
The published documents suggest the design won’t change much. The Fit4 keeps the band shape with a rectangular display, and the sensor and charging contacts on the back are laid out much like the Fit3’s.
Rather than an all-new design, this looks more like the same basic package with updated internals.
For wireless connectivity, the Fit4 supports Bluetooth 5.4, one step up from the Fit3’s Bluetooth 5.3.
Don’t expect a new Bluetooth version to feel very different in daily use, though. It’s better read as a small refinement to connection efficiency and stability.
Some certification-related materials mention a Goodix GH3036 sensor.
That’s part of the optical sensor family wearables use for heart rate tracking, so the Fit4 will most likely carry over the Fit3’s core health features, such as heart rate and sleep tracking.
Whether the Fit4 gets built-in GPS and NFC (the short-range radio used for tap-to-pay) is still hard to say. If you want to map your runs without carrying a phone, GPS could be the deciding factor.
The published FCC documents don’t clearly show either feature. A filing alone can’t reveal every spec, though. GPS receivers don’t transmit, so they wouldn’t necessarily appear in an FCC radio test, as Gadgets & Wearables notes. Until Samsung makes an official announcement, it’s best not to assume either feature is missing.
When is the Galaxy Fit4 release date?
The release date is the big question right now. Clearing the FCC means preparations for a launch are well along, but certification doesn’t lead straight to retail sales.
Given the usual timeline after certification, and the fact that the September joint launch already fell through, a fourth-quarter 2026 reveal is a reasonable possibility. That is not an official schedule. Samsung could also skip an Unpacked event and simply post it on Samsung Newsroom or Samsung.com, then start sales.
A slip into next year can’t be ruled out either. Some exhibits filed with the FCC, including external photos and the user manual, are kept confidential until Jan. 31, 2027. That date only marks when the documents become public. It is not the product’s release date.
Galaxy Fit4 vs. Fit3: what’s likely to change
Based on what’s confirmed so far, the Fit4 looks less like a big generational leap and more like a refined version of the Fit3’s basic setup.
The design will likely stay similar. The only differences we can state with confidence today are the wireless standard and the likely sensor. How much the display, battery and health features change won’t be known until official specs come out.
| Galaxy Fit3 | Galaxy Fit4 (from the FCC filing) | |
|---|---|---|
| Model number | SM-R390 | SM-R391 |
| Bluetooth | 5.3 | 5.4 |
| Design | Rectangular-display band | Similar band shape, similar back layout |
| Heart rate sensor | Optical | Optical (Goodix GH3036 mentioned) |
| Built-in GPS / NFC | — | Not confirmed |
| Price and release date | On sale | Not announced |
For reference, the Fit3 is light, works with Samsung Health and supports Emergency SOS. Samsung’s launch announcement also lists a 1.6-inch display, up to 13 days of battery life, a 5ATM and IP68 rating, and Fall Detection. In the US, the Fit3 has been on sale since January 2025, according to SamMobile.
Because the Fit3 has been out for a while, it often sells below its launch price. Once the Fit4 arrives, compare the price gap as well as the features.
Should you buy the Galaxy Fit3 now?
The FCC filing confirms that the Galaxy Fit4 is on its way, but the exact release date, price and detailed features are still unannounced. If you already own a Fit3, there’s little reason to rush into an upgrade.
If you need a band now, the discounted Fit3 is worth a look first. For the Fit4, the Galaxy Fit4 release date matters less than what it actually adds, so wait for the feature list before deciding.
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