How can I find the purchase date of my iPhone?

Look in settings under Battery Health and see what the First Use date shows (it will not show the specific day but it will show the month and year for the first use). If you need specific details like the exact date then you will likely need to contact your carrier to see if they can tell you when it was first activated. If you’re trying to find the date you purchased it and don’t have the receipt you may need to contact where you purchased from (if it was Apple and ordered online it should show in the Store App under orders). Or if you used a credit card for purchase you may be able to look at your past transactions to locate the purchase

Ask your carrier when they activated it.

Crsmom00 Said:

"how do i find the age of my phone: I have an iPhone 14 Pro Max. How do I find out when I started using ot"

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Finding Original Purchase Date:

Look at the original point of sale (the sales receipt).

Can I ask why you want to know this? Just curious