How do I get my old text messages back this is a new phone

Assuming you have the same telephone number and cellular carrier, choose a method other than Quick Start to set up your new iPhone using this as a guide:

Transfer data from your previous iOS or iPadOS device to your new iPhone, iPad, or iPod touch - Apple Support

How did you set up the new one? Did you use Quick Start or did you set it up from your backup?

its the same carrier same apple ID

new number new phone

but i transferred everything to my new phone

New number means you start over with messages.