Does anyone know if you can purchase the Urbane Lte from AT&T off contract and without their sim and then add it as a wearable device with a T Mobile sim? I have the 3G Samsung S2 but would love to purchase and compare it to the Urbane before the 14 day return period expires. My only other option appears to be to wait for Amazon to notify me when the unlocked Urbane is available for $399.