I want to buy an free sim iphone, does someone know if i can get it at the store or i need to buy it online?

Purchase Apple Products from the Apple Online Store, Apple Retail Stores, and many Apple-authorized resellers and wireless service providers.

I do not think Apple delivers its products to international destinations for individual customers.

IMPORTANT RESTRICTION FOR iPHONE, iPAD, APPLE TV AND HOMEPOD SERVICE.

Apple may restrict warranty service for iPhone, iPad, Apple TV and HomePod to the country where Apple or its Authorized Distributors originally sold the device.

You need to buy it directly from Apple, either an Apple Store or Apple Online, in the country where you will be using it.