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The Apple Watch Series 11 is Apple's latest smartwatch, featuring a ton of health-tracking features, fall and crash detection, and up to a 24-hour battery life. And right now at T-Mobile, you can save $300 on one when you add a new watch line to your mobile plan -- getting you our pick for the best Apple Watch with a cellular plan for $199, saving you 60% off the regular price of $499.

Of course, carrier discounts like this come with some caveats: In this case, you'll purchase the new Apple Watch Series 11 42mm on a monthly payment plan and pay the applicable sales tax on the pre-credit price at the time of purchase. You'll also add a new line on Watch Plan Plus. You'll get paid up to $300 back via 24 monthly bill credits. If you cancel your account before the 24 months is up, the credits will stop, and the remaining balance on all devices at full price will be due. The bill credits also end if you pay off your watch early.

The new line and wearable service plan start at $15 per month when you sign up for AutoPay, plus taxes and fees, and there's a $35 device connection charge.