Just bout my iPhone 12 half of my other phone was downloaded still says downloading stuck it seems

Hello Christi0416, Thanks for reaching out to us for support. We’d be glad to see how we can help with the data transfer issue you mentioned on your iPhone. Start by trying the steps below, and if they are unsuccessful, provide us with some specifics on what you’re seeing for more help. Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch

Also, please keep in mind that If your internet connection is weak or for any other minor causes, your iPhone may take longer to complete the data transfer and you may perceive it as the phone being stuck while transferring data. If this is the case, we recommend waiting for a few minutes to let the process complete. Thanks for using the Apple Support Communities. Cheers!