Does this phone work via Bluetooth connection with cellphone? Or does it only work if it has its own sim card?

Hello. This watch phone can work via both 2 way. You can insert a SIM card or connect to WIFI and use it as a independent phone. If you don't want to use the sim card, it can also be connected with your phone and work as a Bluetooth watch.

My question is if i use the watch with a sim card can i answer calls with my bluetooth headphones so that everyone around me don’t have to hear the co

Yes,you could use the Bluetooth headphones to answer calls. Other people around you won't hear the sound.

Do you know what is the operating system?

Hi, the operating system is Android 7.1.1

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4G Smart Watch 2.86 Inch Screen Android 7.1 3GB+32GB 5MP Camera 2700mAh Battery Smartwatch for Men, Silver

4G Smart Watch 2.86 Inch Screen Android 7.1 3GB+32GB 5MP Camera 2700mAh Battery Smartwatch for Men, Silver

Product ID: 376747202

Details

Battery Capacity
2700 Milliamp
Connectivity Technology
Cellular
Memory Storage Capacity
32 GB
Operating System
android 7.1
Special Feature
Camera

📱2.86" immersive display

📶4G LTE connectivity

🔋2700mAh long-lasting battery

Description

⌚️ Own the biggest, boldest wrist tech—because your time deserves a screen that commands attention.

SEE MORE DO MORE - Experience the largest 2.86-inch 640x480 LCD screen for unmatched clarity and multitasking ease.
CAPTURE LIFE ON THE GO - 5MP camera delivers crisp selfies and video calls, perfect for capturing moments without missing a beat.
POWER THROUGH YOUR WEEK - Massive 2700mAh battery ensures up to 2 days of use—cut the charger cord and stay unplugged longer.
STAY CONNECTED ANYWHERE - Built-in 4G LTE with nano SIM slot lets you make calls and use apps independently—no phone needed.
HEALTH AT YOUR FINGERTIPS - Advanced heart rate sensor tracks your workout, recovery, and daily health metrics seamlessly.

The Rainbuvvy 4G Smart Watch features a groundbreaking 2.86-inch high-res LCD display, Android 7.1 OS, 3GB RAM, and 32GB storage. With full 4G LTE support, a 5MP camera, built-in GPS, and a robust 2700mAh battery, it functions as a standalone smartphone on your wrist. Designed for men who demand style, connectivity, and health tracking in one sleek, silver aluminum frame with IP67 water resistance.

Specifications

ASIN	B07YCDGSHZ
Age Range Description	Adult
Band Color	silver
Band Material Type	Silver
Battery Average Life	2 Days
Battery Capacity	2700 Milliamp Hours
Battery Cell Type	Lithium Polymer
Battery Power	2700
Best Sellers Rank	#1,201,194 in Electronics ( See Top 100 in Electronics ) #15,039 in Smart Watches
Box Contents	Charger, Smart watch, Watch band
Brand Name	Rainbuvvy
Case Material Type	Aluminium
Cellular Technology	4G
Clasp Type	Buckle
Closure Type	Buckle
Colour	Silver
Communication Feature	[Multiple]
Compatible Devices	Mobile Phone
Compatible Phone Models	Android 6.0 and above or iOS 11.1 and above
Connectivity Technology	Cellular
Controller Type	Touch Control
Customer Reviews	3.6 3.6 out of 5 stars (523)
Display Type	LCD
GPS Geotagging Functionality	Built-in GPS
Human Interface Input	Touchscreen
Item Type Name	smart watch
Item Weight Unit of Measure	0.11 Ounces
Manufacturer	Refly
Memory Storage Capacity	32 GB
Metrics Measured	optical_heart_rate_sensor, camera
Model Name	Smartwatch
Model Number	DM100
Operating System	android 7.1
Product Features	Camera
RAM Memory Installed	3 GB
Resolution	640 x 480
Screen Size Unit of Measure	2.86 Inches
Shape	Rectangular
Sim Card Size	Nano
Sport Type	Walking
Style Name	Modern
Supported Application	Camera
Supported Satellite Navigation System	GPS
Target Audience	Men
Water Resistance Depth	1 Metres
Water Resistance Level	Waterproof
Waterproof Rating	IP67
Wearable Computer Type	Smart Watch
Wireless Compability	Bluetooth
Wireless Provider	T-Mobile

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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