Is iPhone 14 Pro Max supporting 2 physical SIMs? Is the warranty valid out of Hongkong?

Go to iPhone - Apple and check the tech specs page. Change the country you’re shopping in with the country tab at the far bottom right if the page.

iPhone 14 models in the USA have no physical SIM slot at all and only support eSIMs. Elsewhere, like previous 5G iPhones the iPhone 14 models support a single physical SIM slot and eSIM.

iPhone models sold in Hong Kong, Macau and mainland China support dual physical nano SIMs.

iPhone warranties, as always, include the clause that support may be limited to the countey of original purchase. The iPhone warranty has never been international.

Legal - Hardware Warranties - Apple

Apple warranty specifically says iPhone Warranty May Be Limited To The Country of Purchase. If you buy your iPhone in Hong Kong, and live in a different country, if you need warranty support, you'll have to go back to Hong Kong.

Yes. iPhones sold in Hong Kong, China and Macau are the ONLY iPhone's sold with two physical sim card capability.

You're welcome.