Samsung Electronics’ next smart band, the Galaxy Fit4, passed US Federal Communications Commission (FCC) certification on August 4, 2026. However, as of September 18, 2026, there has been no official announcement from Samsung.

Product image of the previous model, the Galaxy Fit3 Product image of the previous model, the Galaxy Fit3 — Source: Samsung

Certification progress and launch timing signals

Galaxy Fit3 launch path and Fit4 certification timeline Galaxy Fit3 launch path and Fit4 certification timeline — Source: self-rendered based on dates from Electronic Times, Gadgets & Wearables, and TheElec

The model number of the FCC-certified device is SM-R391. The Galaxy Fit3 is SM-R390, and the wearables outlet Gadgets & Wearables reported that the name FIT4 appears repeatedly in the FCC documents Samsung submitted.

According to the same outlet’s analysis, the test lab received the sample on July 15, and the sample had hardware REV2.0 with software R391XXU0AZG2. That can be read as meaning it’s past the early prototype stage, but it isn’t confirmation that it’s the final retail hardware.

Launch timing predictions have already missed once. In June, SamMobile expected the Fit4 to come out around September alongside the Galaxy S26 FE and Galaxy Tab S12 series, but Samsung unveiled only the S26 FE on August 27 and began Korean sales on September 4. The expectation, reported by CEO Score Daily, of an unveiling at IFA 2026 in September didn’t materialize either.

In the FCC database, the external photos, internal photos, and user manual are set to stay confidential until January 31, 2027. That’s the result of Samsung requesting 180 days from the certification date, so it isn’t tied to the launch date, and they can be released earlier once the product comes out.

The Galaxy Fit3 was unveiled overseas on February 22, 2024, but it received Korean radio certification on March 6 and only launched in Korea on April 3.

Specs confirmed by FCC documents

Concept image of the band structure confirmed by FCC documents Concept image of the band structure confirmed by FCC documents — Source: concept image · self-generated with agy

Item Galaxy Fit3 Galaxy Fit4 (FCC)
Model number SM-R390 SM-R391
Bluetooth 5.3 5.4
Screen shape Rectangular Rectangular (similar)
Back Heart rate sensor, charging contacts Heart rate sensor, 2 charging contacts
Wi-Fi, NFC, LTE None None per documents

On the back in the FCC drawings, there’s an optical heart rate sensor in the center, two charging contacts, and strap release mechanisms, and there’s a physical button on the side. Gadgets & Wearables saw it as carrying over the Fit3’s design overall.

The confirmed wireless change is Bluetooth 5.4 (supporting BR/EDR and Bluetooth Low Energy). All transmitters listed in the documents are in the 2,402–2,480MHz band, so there’s no sign of Wi-Fi, NFC, LTE, or UWB. Without NFC, features such as Samsung Wallet transit cards and payments are unlikely.

The sample contained a battery from EVE (model HQ-8339EV), and charging cradles from four manufacturers were tested.

Unconfirmed specs

Maximum battery life of budget bands compared Maximum battery life of budget bands compared — Source: self-rendered based on figures announced by Electronic Times, Xiaomi Korea, and 9to5Google

[Battery capacity] No capacity listed in the FCC documents. The Fit3 has 208mAh for up to 13 days

[Built-in GPS] GPS is receive-only, so not appearing in the FCC transmitter list doesn’t tell you whether it’s included

[Sensor changes] Some leak reports mentioned a Goodix GH3036 optical sensor, but there’s no official confirmation

[Operating system] SamMobile expects it to keep the existing RTOS rather than Wear OS

The Galaxy Fit3 has no built-in GPS, so to record an outdoor running route you have to take your smartphone along. Some early reports wrote that the Fit4 has no GPS based on the FCC documents, but Gadgets & Wearables countered that since satellite signals are only received, the transmitter list can’t tell you.

The Fit3’s reference points are 18.5g weight, a 1.6-inch AMOLED screen, IP68 and 5ATM water resistance, up to 65% in 30 minutes of charging, and fall detection and emergency SOS.

Competing products and price range

Budget band prices compared Budget band prices compared — Source: self-rendered based on prices from Electronic Times, Xiaomi Korea, and 9to5Google

The Galaxy Fit3’s Korean list price was ₩89,000. The Fit4’s price isn’t known.

The Xiaomi Smart Band 10, which competes in Korea at a similar price, came out in June 2025 at ₩59,800 (ceramic model ₩79,800) and touts up to 21 days of battery.

In May, Google launched Fitbit Air, a screenless band, in the US for $99.99 (about ₩140,000). It weighs 12g including the band, lasts up to 7 days, and has a Gemini-based health coach feature.

By market research firm Omdia’s count, wearable band market share in 2025 was Xiaomi 18%, Apple 17%, Huawei 16%, and Samsung Electronics 9%.

What to watch for the launch

Summary of what to watch for the Galaxy Fit4 Summary of what to watch for the Galaxy Fit4 — Source: summary of the article · self-rendered

  • If SM-R391 appears on the National Radio Research Agency’s radio certification list, that’s a sign a Korean launch is near. The Fit3 came out in Korea about 4 weeks after radio certification
  • The Galaxy Tab S12 series is rumored to launch on October 7, so whether the Fit4 is unveiled alongside it is the next thing to watch
  • Whether the price holds at the Fit3’s ₩89,000 level and whether it gets built-in GPS are the items that will set the comparison with the Xiaomi Smart Band 10

Sources