Hi there, thank you for reaching out to us with your question about the Samsung Galaxy Watch4. There are two version of this device, one that is Bluetooth enabled and does not require additional monthly fees to function, but does need to be in range of your cell phone to have full functionality. There is also an LTE version that does require a monthly fee for a phone line and does not need to be in range of your cell phone to have the full functionality. Thank you for being a Samsung customer. -Elizabeth