TikTok disappeared from iPhone

It did not delete off your iPhone on it's own. Either way, you still won’t be able to download it as they still face a ban in the US.

Read Apple’s statement: About availability of TikTok and ByteDance Ltd. apps in the United States - Apple Support

IMPORTANT UPDATE:

The TikTok app has returned to the App Store.

Good luck! 👋🏼😉

Please read my latest User Tip fully explaining the TikTok ban situation:

Understanding the TikTok Ban and Why You Cannot Download It