change my phone

It would depend on your location what they might do. In the US, Apple is still listing a $129 (plus tax) screen repair price. I'm not sure if that would mean an actual screen assembly replacement on the same device, returned to the customer. I could also be a complete service replacement in exchange for the damaged device.

iPhone Screen Repair & Replacement - Official Apple Support

The price and availability may vary depending on your location and access to Apple direct service or an Apple Authorized Service Provider.

Are you asking if you can trade-in your current iPhone and get a new one? Is so, then it may be possible, but I wouldn't expect that you will receive much, if anything, for the trade-in. On the other hand, if you are asking will Apple replace your phone at no cost, then QuickTimeKirk has provided you with the answer.

Sell your broken device and buy what you want.

No.