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If you don't want to be authorized by a carrier at the time of purchase, then you'll need to contact that carrier to activate your iPhone.
There are some countries that do not have access to LTE data. The availability of LTE data depends on whether the carrier supports certain LTE radio frequencies. For information on international roaming rates or policies, please contact your wireless carrier.
Notable is the inclusion the Apple A15 Bionic processor - Apple claims it is half the speed of other mobile processors. Both the Pro Max & Pro Max now have an upgraded 5-core CPU. This is in addition to a 120Hz touchscreen, upgraded battery, camera sensor improvements, and a more powerful processor.