The Samsung Galaxy S10 5G was the outlier of the S10 generation — and deliberately so. While the S10e, S10, and S10+ occupied a familiar spec ladder, the S10 5G was something else: a 6.7″ phablet-sized phone released in April 2019, the first 5G-capable smartphone Samsung had produced, and the first Samsung phone to carry a rear Time-of-Flight depth sensor. It was also the largest S10 by a significant margin, with a 4500mAh battery that no other S10 model matched.
I’m Yanis, founder of MiraLab. I’ve been tracking Samsung DeX across every generation since the S8 launched it in 2017, and the S10 5G has always struck me as an underrated chapter of that story. Most coverage at launch focused on 5G network availability — which was sparse in 2019 — and missed what the device offered as a mobile workstation. Seven years later, it’s worth revisiting on its own terms.
Samsung DeX on the Galaxy S10 5G: What the Largest S10 Actually Delivers
The S10 5G runs the same DeX implementation as the rest of the S10 family. By 2019, DeX had matured significantly from its S8-era dock-dependent origins: it worked with any USB-C monitor via DisplayPort Alt Mode, launched automatically on cable connection, and offered a genuinely windowed desktop interface rather than a scaled-up phone UI.
What the S10 5G specifically contributes to the DeX picture:
- 4500mAh battery — the real DeX advantage — The S10 5G carries 500mAh more than the S10+ and 1000mAh more than the standard S10. DeX draws more power than passive use, and that extra capacity translates directly into longer working sessions away from a wall outlet. If you’re running a lapdock setup untethered — on a train, in a café, between meetings — the battery lead over the rest of the S10 family is real and noticeable.
- 6.7″ display as a secondary touch panel — When plugged into a lapdock or external monitor, the phone screen remains active as a touch-input secondary display. At 6.7″, it’s large enough to keep a chat app, reference document, or media player comfortably visible alongside the main DeX workspace. Other S10 models offer a secondary screen too, but the size difference here is meaningful.
- Snapdragon 855 / Exynos 9820 performance — The S10 5G shares its chipset with the rest of the S10 family. DeX performance is solid: browser with a dozen tabs, Slack, email, and a document editor run concurrently without thermal throttling or lag under typical workloads. The chip is not a bottleneck in 2026 for the productivity tasks DeX is actually used for.
- Full Samsung DeX support, wired and wireless — Wired DeX via USB-C DisplayPort Alt Mode works from the factory. Wireless DeX arrived via the Android 10 / One UI 2.0 update, allowing cable-free desktop sessions on compatible Samsung Smart TVs (2019 and later). The wireless mode has acceptable latency for document work and is genuinely useful in rooms with the right TV hardware.
- USB 3.1 Gen 1 — one honest caveat — Despite being the top-specification S10 model, the S10 5G ships with USB 3.1 Gen 1 rather than the Gen 2 port found in the standard S10 and S10+. This caps throughput at 5 Gbps versus 10 Gbps. For almost all DeX users this is invisible in daily use, but anyone running heavy simultaneous file transfer and external display output will hit the ceiling faster than on the standard S10.
One significant trade-off that’s unique to the S10 5G within the S10 family: there is no microSD card slot. The S10, S10e, and S10+ all support up to 1TB of expandable storage; the S10 5G is internal-only, starting at 256GB. For DeX users who rely on local file storage rather than cloud-first workflows, this is a meaningful constraint. The 256GB base is workable, but there’s no path to expanding beyond it.
The S10 5G’s final OS is Android 12, with security patches ending in 2023. For a productivity device, this requires good security hygiene — a VPN on untrusted networks, thoughtful app selection — rather than being a hard stop on using it. For a full picture of how the S10 series fits into DeX history, my piece on Samsung DeX vs Android Desktop Mode covers the evolution of the platform from its S8 origins through the current generation.
How to Use the Galaxy S10 5G with a Lapdock
A lapdock transforms the S10 5G into a portable laptop-equivalent. One USB-C cable carries video output, keyboard input, trackpad input, and power delivery simultaneously. DeX launches automatically when the connection is established — no settings toggle needed.
Option 1: USB-C lapdock with DisplayPort Alt Mode (the cleanest setup)
The S10 5G supports DisplayPort Alt Mode natively. Plug into a compatible lapdock and the DeX desktop appears within seconds. The phone screen can continue running Android independently — useful for keeping a secondary app visible, or for using the S10 5G’s large 6.7″ display as an actual secondary workspace. The lapdock collection at mobile-only.com is the right place to start for S10 5G compatibility confirmation — USB-C Alt Mode negotiation varies between lapdock manufacturers, and a compatibility-verified unit avoids the frustration of a return.
Option 2: USB-C hub or DeX dock for a desk setup
For a fixed workstation configuration, a USB-C hub with HDMI or DisplayPort output connects the S10 5G to any external monitor. Pair a Bluetooth keyboard and mouse and you have a proper desktop. The Samsung DeX docks at mobile-only.com are curated for Samsung hardware compatibility — generic hubs sometimes fail the power delivery handshake that DeX requires, and buying a tested unit rather than a random hub is the faster path to a working setup.
Option 3: Wireless DeX on a compatible Samsung Smart TV
Open the DeX app on the S10 5G, select a compatible Samsung Smart TV from the network list, and the desktop appears on the TV over Wi-Fi. Pair a Bluetooth keyboard and mouse to the phone — no additional cables needed. Latency is acceptable for writing and web browsing; not a setup for anything latency-sensitive. For presentations or spontaneous working sessions in rooms with compatible hardware, it removes all the cable setup entirely.
Best DeX Accessories for the Samsung Galaxy S10 5G
The S10 5G is DeX-capable from the USB-C port out. The accessories that complete it as a workstation:
- A USB-C lapdock — The central piece of any mobile-only S10 5G setup. One cable in, full desktop out. The lapdocks at mobile-only.com list S10 series compatibility explicitly, which matters more than the spec sheet alone.
- A 45W USB-C charger with PD — The S10 5G supports 25W Adaptive Fast Charging, but in a desk DeX setup where you’re also powering a hub or dock, a higher-wattage charger at the wall ensures the phone stays topped up rather than slowly draining. A 45W GaN charger is the practical sweet spot.
- USB-C hub with pass-through charging — For desk setups connecting to a non-powered monitor, a USB-C hub with Power Delivery pass-through lets you drive the external display and charge the S10 5G simultaneously through a single cable to the phone. This is how you avoid the “phone draining during DeX” problem.
- Bluetooth keyboard and mouse — Any standard Bluetooth peripheral pairs cleanly with the S10 5G. No proprietary protocol or dedicated Samsung accessory required. Works for wired DeX, wireless DeX, and desk hub setups equally.
- USB-C to USB-A adapter for peripherals — The S10 5G has a single USB-C port. If you need to use a USB-A peripheral in a DeX session, a small adapter or a hub with USB-A ports handles this cleanly.
My Take: Is the Galaxy S10 5G Still Worth Using for Samsung DeX in 2026?
The S10 5G has always been the overlooked member of the S10 family. At launch, the 5G story overshadowed its other characteristics, and 5G coverage in 2019 was thin enough that many buyers passed. The trade-offs — no microSD, no headphone jack, USB 3.1 Gen 1 despite the premium positioning — were easier to criticize than its advantages were to appreciate.
In 2026, the balance reads differently.
If you own an S10 5G — use it with a lapdock. The Snapdragon 855 / Exynos 9820 handles the real workloads DeX users run: browser, documents, email, Slack, video calls. The 4500mAh battery is a genuine edge over the rest of the S10 line for untethered sessions. Android 12 is fully capable for productivity. The security patch situation requires sensible hygiene, not a drawer for the device.
If you’re buying second-hand specifically for DeX — the S10 5G is worth considering if the price is meaningfully lower than the standard S10 or S10+. If the price gap is small, I’d lean toward the S10 or S10+ for the microSD slot and USB 3.1 Gen 2 port. But if the S10 5G is the better-priced option, the battery advantage makes it a serious contender for anyone running long untethered sessions.
The S10 5G’s place in history: it was the first 5G phone to support Samsung DeX, and it remains the most battery-capable member of the S10 family. Samsung DeX has evolved considerably since 2019, and a current Galaxy S24 or S25 runs it more smoothly. But the S10 5G is a real DeX device — and a lapdock is still the accessory that unlocks what it actually is.
The phone is the computer. The accessories make that real.
Take care,
Yanis@MiraLab
