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Where did this definition of 'without authorization' come from?

"Without authorization, means any device the carrier did not directly and knowingly assign to your account. Even if you have a valid account and are a paying customer, cloning a device to that account is unauthorized, because the device being authenticated and authorized on the network is the donor device not the device you cloned. An example of this but not limited to this example is cloning a Motorola flip phone to a Samsung Epic smart phone, The Samsung epic would authenticate as a Motorola flip phone, not a Samsung Epic Smart phone. The carrier did not explicitly authorize this smart phone device, and it is accessing the network in an unauthorized and illegal manner."


Yet according to TMobile's use of SIM cards:

"The SIM card is the brain of a digital phone. It is a card that comes with T-Mobile phones, featuring a computer microchip. You can easily insert the card into the phone or transfer it into other phones, retaining your phone book and personalized service information."

And from AT&T
"SIM cards allow users to easily switch their account information between other compatible GSM devices for immediate use. "


The service associated with the SIM does not change, regardless of what phone or device. "Without authorization" for a specific device, as defined by and exampled in the original post, is not accurate. The SIM card is the authorized device.