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The iPhone 13 Pro Max's Super Retina XDR panel has been upgraded to allow for a 1000 Nits brightness as well as a smooth variable rate of 10 to 120Hz via Apple's ProMotion technology.
All iPhone models are international phones and can be used almost anywhere. It doesn't matter if your iPhone is a GSM or CDMA customer. You can roam internationally with GSM networks from more than 200 countries. To verify international roaming, contact your wireless carrier if your iPhone was purchased with them.
This is due to carrier support for certain LTE radio frequencies. For more information about international roaming rates and policies, contact your wireless carrier.