iPhone -->
https://www.apple.com/legal/warranty/products/ios-warranty-document-us.html
IMPORTANT RESTRICTION FOR iPHONE, iPAD, APPLE TV, HOMEPOD, AND APPLE VISION PRO SERVICE.
Apple may restrict warranty service for iPhone, iPad, Apple TV, HomePod, and Apple Vision Pro to the country where Apple or its Authorized Distributors originally sold the device.
MacBook Neo-->
https://www.apple.com/legal/warranty/products/embedded-mac-warranty-us.html
Apple reserves the right to change the method by which Apple may provide
warranty service to you, and your Apple Product’s eligibility to
receive a particular method of service. Service will be limited to the
options available in the country where service is requested. Service
options, parts availability and response times may vary according to
country. Apple may use Apple Products or replacement parts for service
that are sourced from a country that is different from the country from
which the Apple Product or original parts were sourced. You may be
responsible for shipping and handling charges if the Apple Product
cannot be serviced in the country it is in. If you seek service in a
country that is not the country of purchase, you will comply with all
applicable import and export laws and regulations and be responsible for
all custom duties, V.A.T. and other associated taxes and charges. For
international service, Apple may repair or replace Apple Products and
parts with comparable Apple Products and parts that comply with local
standards.
Les prix affichés aux États-Unis n'incluent pas la taxe de vente. Contrairement à d'autres pays, cela n'est pas remboursable lors de l'exportation d'un appareil.
Mon iPhone américain va-t-il fonctionner en France?
https://communities.apple.com/fr/docs/DOC-250009908
https://eshop.macsales.com/guides/Mac_OS_X_Compatibility
https://support.apple.com/HT213325