If you've decided to buy an Apple Watch Series 3 with cellular, it's going to cost you. For one, it's $70 more than the GPS-only Series 3 watch. But there's also a somewhat hidden cost: You're going to need a data plan.
Don't worry, you're not going to need a separate data plan just for your watch. But even though the wearable uses your existing wireless plan, LTE connectivity on Apple Watch Series 3 doesn't come free. No matter your carrier, you'll be paying a little extra in your monthly bill. So, before you commit to more charges, consider how much an Apple Watch data plan will cost.