This is not only a smart watch, but also a smart phone! It can use a SIM card to make a call.

Model: H8
Available colors: champagne gold / black
Features: SIM card / independent mobile communications
Material: metal housing, leather strap
Waterproof: life waterproof

Operating System: Android 4.22
Storage capacity: 8/16/32 / 64GB (optional, this item is 8GB)
Processor: 1300Mhz dual-core
Running memory: 512M
Screen size: 1.5 inches
Screen parameter: Retina 16 million colors, AMOLED 240x240 / 236ppi, multi-touch
Menu Language: multiple languages
Screen material: glass panel
Bluetooth Version: 4.0
Hands-free function: Support
Wifi: Support, 802.11b / g / n
SIM card: micro-SIM card (no lock)
2G: GSM 850/900/1800/1900
3G: WCDMA 850/900/1700/1900 / 2100MHz
GPS Positioning: Support
Camera: 3.0M pixels (physical pixel), 5.0M pixels (interpolated pixels)
Audio format: MP3, MIDI, OGG, PCM, WAVE and more
Video formats: JPEG, GIF, BMP, PNG, MPEG and more
Battery Type: Lithium Battery
Battery capacity: 3.7v, 600mAh (included)
Standby time: 75 hours
Talk time: 2-3 hours (depending on network availability)
Charging dock: USB interface charging dock, input voltage 5V

Notice:
1. Waterproof for daily life only, not for swimming or bathing.
2. External damage, or influent lead to short-circuit connections, are not responsible for warranty.
3. SIM card Band:
GSM 850/900/1800/1900
WCDMA 850/900/1700/1900 / 2100MHz
4. It can be a stand-alone phone.