How do I merge my old phone with my new one?

Hi purty01,

Welcome to the Apple Community.

Wondering if one of these articles from Apple Support will help you :

I'm assuming you want everything on the new phone ... not quite sure what "merge" means to you.

Use these steps to transfer information to your new device, then remove your personal information from your old device.

https://support.apple.com/en-au/HT201351

OR

How to transfer your personal data and purchased content to your new device using your previous device's iCloud backup:

https://support.apple.com/en-us/HT210217

Please feel free to "Post" here again, if you still need help ... ("merge" may mean you want to have same data on both phones ?)

Cheers:)