S21 Ultra Android Smartwatch Review 2025: Full Android 10, 5G, Rotating Camera, Play Store Apps, Games, Fitness Tracking, and Long Battery Life You Need to Know

I never thought I’d leave home without my phone, but the S21 Ultra Android Smartwatch changes that. Whether it’s a quick walk, a grocery run, or just lounging around the house, this watch lets you stay connected without carrying a bulky device.

I’ve spent a few days with it, and honestly, it feels more like a tiny smartphone than a traditional smartwatch. Calls, WhatsApp, Google Maps, YouTube, even light games it can handle all of it. For under ₹5,000, that’s pretty impressive.

Design and Display: Small but Solid

At first glance, it doesn’t scream luxury but the moment you hold it, it feels surprisingly premium. The metal frame feels solid and the screen is bright and clear. Sunlight? No problem the display stays readable even outside.

The rotating camera on top isn’t just a gimmick. It adds personality to the watch and is genuinely practical for selfies or quick video calls. Despite its features, it sits comfortably on the wrist without feeling heavy.

Performance: Android Unlocked

I was surprised that, unlike most smartwatches, this one doesn’t just mirror my phone. Apps from the Play Store worked well just like they do on my regular phone

With 8GB RAM and 128GB storage, it handles multitasking smoothly. I tried scrolling through Instagram while watching a video and replying to messages simultaneously no noticeable lag. It’s hard to believe all of this fits on something that small.

Camera: Rotating and Useful

The 12MP rotating camera is surprisingly handy. Flip it forward for selfies, backward for quick photos or video calls. It won’t replace a high-end phone camera, but for casual snaps, it’s more than enough. Travelers or vloggers who want something compact will appreciate this feature.

Battery Life: Reliable

Smartwatch batteries usually disappoint, but this one lasts. On moderate use, I easily got 3–5 days on a full charge, even with GPS and Wi-Fi on. The magnetic charger is simple and effective a full charge takes about two hours.

Connectivity: Works Without Your Phone

The S21 Ultra really shines because it doesn’t need your phone to function. You can insert a 5G SIM, make calls, use Wi-Fi, turn on a hotspot, or navigate with Google Maps independently.

It even supports voice commands in Hindi and English. Fitness tracking, heart rate monitoring, sleep tracking, and a fingerprint sensor round out the package. For the price, this level of independence is rare.

How It Stacks Up

I looked at the Lemfo LEM16 and Kospet Prime 2 two popular Android watches. Here’s how they stack up:

Feature	S21 Ultra	Lemfo LEM16	Kospet Prime 2
Display	Super AMOLED	IPS LCD	IPS LCD
RAM / Storage	8GB / 128GB	4GB / 64GB	6GB / 128GB
Camera	12MP Rotating	8MP	13MP Rotating
Battery	3–5 Days	2–3 Days	3–4 Days
SIM	5G + Wi-Fi	4G Only	4G Only

Both competitors cost nearly twice as much, yet the S21 Ultra holds its own and even adds 5G support.

Pros and Cons

Pros:

• Full Android 10 with Play Store
• Bright Super AMOLED screen
• 8GB RAM / 128GB storage
• 12MP rotating camera
• 5G SIM + Wi-Fi + GPS + hotspot
• Fingerprint sensor
• 3–5 day battery life

Cons:

• Not water-resistant
• Fitness tracking is basic
• Rotating camera adds slight bulk

Final Verdict

The S21 Ultra Android Smartwatch isn’t just a wearable; it’s a tiny, fully functional Android device on your wrist. For students, travelers, or anyone who prefers fewer gadgets, it’s a practical choice.

It won’t replace your flagship phone completely, but for its price, it comes incredibly close. Available now for ₹4,799 at ZoneAlpha.in, it proves you don’t need to spend a fortune to enjoy a full Android experience on your wrist. You should also check out our detailed review of the Fastrack FS2+ Smartwatch.