received text that files were going to be deleted

Re: "received text on my i phone that files were going to be deleted"

Am wondering if this was a genuine message or not.

You could check whether your iPhone is short on memory / storage space, in which case, unless you act first, your iPhone system may delete some files that could easily be restored, in order to continue doing everything you ask it to do. (Eg: An iPhone generally needs to keep at least 8 Gb free in which to operate smoothly).

See:How to check the storage on your iPhone and iPad - Apple Support

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If short in space: It is wise to back-up everything securely, before you make space on your iPhone:

See: How to back up your iPhone, iPad, and iPod touch - Apple Support

and

See: "Manage space on your iPhone in the article below for tips:

If you need more space for an update on your iPhone, iPad or iPod touch - Apple Support

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Else: If the message seemed suspicious to you:

Use these tips to avoid scams and find out what to do if you receive suspicious emails, phone calls or other messages: Recognize and avoid social engineering schemes including phishing messages, phony support calls, and other scams - Apple Support

If needed: You can:Get help with security issues - Apple Support