You can change subscription devices after the first 90-day contract period. There is no limit to how often you can change your subscription device, but a plan change fee will apply depending on how long you have had the current device. The plan change fee is reduced if you used the device for more than 12 full months. If you have used the device for more than 24 full months, you can change device with no plan change fee.
To change subscription device, head to My Account to get started.