How do you sync your phone to another iPhone wifi?
How do you sync my phone to another apple phone wifi?
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If I understood correctly, you were trying to share your iPhone cellular data to another phone via wifi, like a router. Is that correct?
if so, this feature is called “personal hotspot”and is available in setting (it also depends on your carrier).
But if you meant to sync one phone to another in order to share files or sync music. Well, this is only possible through iCloud, apple music or other services.
you can find more about personal hotspot in here: https://support.apple.com/en-us/HT204023