Reminders list on my iPhone disappeared
Somehow my "Reminder" lists (all of them..MANY MANY that I do on a weekly basis), were just erased off my phone. Very important stuff. Where are they and how can they be retrieved?
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New iPhone 12 Pro, upgraded the reminders… - Apple Community
Other than that, all I can suggest is that you restore the iPhone from a Backup that has those reminders. Be aware that restore is an all or nothing process. You cannot restore only Reminders (for example) and any info on your iPhone between now and when the backup was created will be lost.
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support