How to cancel my data transfer

Hi Na_dang276,

Thanks for using Apple Support Communities. Congrats on the new iPhone, we're happy to help you get that set up. This alert is regarding the temporary iCloud storage you are provided when transferring data. You have 21 days to restore your temporary backup to your new iPhone or iPad before your temporary iCloud storage expires and your backup is permanently deleted. If your new iPhone or iPad doesn’t arrive within 21 days, you can get an additional 21 days to restore your temporary backup before it’s deleted. On your current iPhone or iPad, open Settings and tap Keep My Backup Longer.

To request additional time to restore your temporary backup before it's deleted, contact Apple Support here: Get Support

See more about that alert here: Get temporary iCloud storage when you buy a new iPhone or iPad

Thanks.

You can go to settings then press on your name then you can press iCloud then delete the temp back up off ur iPhone it should fix it