Using US purchased iPhone 15 in Croatia

All iPhone models are world phones, so you can use them almost anywhere. Whether you are a GSM or CDMA network customer, you can roam internationally on GSM networks in over 200 countries or regions around the world. Availabilitys of LTE data varies in some countries or regions and depends on carrier support for certain LTE radio frequencies. Contact your wireless carrier for more information regarding international roaming policies and rates.

1. Wireless network provider support and features for iPhone · Afghan Wireless · Roshan · American Samoa Telecommunications Authority. Wireless network provider support and features for iPhone ...
2. Wireless carrier support and features for iPhone · eSIM · FaceTime over Cellular · Personal Hotspot · VoLTE · Wi-Fi Calling. Andorra. Andorra Telecom Find wireless carriers and worldwide service providers that ...

If you do not buy Apple Care+ then...

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.

Service & Support. Apple Authorised Service Providers and Online Support. Explore Service Locations. 

Find Locations - Apple

1. If you desire to buy a brand-new iPhone then
   1. Purchase Apple Products from the Apple Online Store, Apple Retail Stores, and many Apple-authorized resellers and wireless service providers.
   2. If you choose "Connect to a carrier later" (Unlocked iPhone) when you buy your iPhone, you can activate your service when you receive your device.
   3. If you're asked to transfer your SIM, follow the onscreen instructions to transfer service from your previous iPhone. To learn more, visit About eSIM on iPhone - Apple Support.
2. If you plan to buy a second-hand device
   1. If you are buying Second-hand then please demand an original receipt of purchase issued by the Apple Online Store, Apple Retail Stores, and many Apple-authorized resellers and wireless service providers from the person/agency that is selling you the device.
3. Check for Activation Lock before you buy a device from someone else
   1. 1. Before you buy an iPhone, iPad, iPod touch, or Apple Watch from someone other than Apple or an authorized Apple reseller, make sure that the device is erased and no longer linked to the previous owner’s account. Ask the seller whether or not they've turned off Activation Lock, then follow these steps:
      2. Turn on the device and slide to unlock.
      3. If the passcode lock screen or the Home screen appears, the device hasn't been erased. Ask the seller to completely erase the device by going to Settings > General > Reset > Erase All Content and Settings. Don't take ownership of any used iPhone, iPad, or iPod touch until it's been erased.
      4. Begin the device setup process.
      5. If you're asked for the previous owner’s Apple ID and password, the device is still linked to their account. Hand the device back to the seller and ask them to enter their password. If the previous owner isn't present, they can remove the device from their account by signing in to icloud.com/find. Don't take ownership of any used iPhone, iPad, or iPod touch until it has been removed from the previous owner’s account.
      6. You will know that a device is ready for you to use when you're asked to "Set up your iPhone," “Set up your iPad," or “Set up your iPod” the first time you turn it on.
4. If you buy a device that's still linked to a previous owner's account, contact them as soon as possible and ask them to erase the device and remove it from their account. Learn how to remove a device from a previous owner's account.
5. IMPORTANT RESTRICTION FOR iPHONE, iPAD, APPLE TV, AND HOMEPOD SERVICE.
   1. 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.