I inadvertently upgraded Reminders as part of the ios 13 upgrade, and now dont see all the old reminders!

I am very disappointed. I have update IOS on my iPhone 6 and iPad 6th. On my iPad, it is working well. But I lost all my reminders on my iPhone. How can I get them from my iPad to my iPhone, once my iCloud is full?

Explained here:

Get ready for the new Reminders app - https://support.apple.com/HT210220

So frustrating. After the recent upgrade my iphone10x is a mess! All my contacts will not upload to my car Bluetooth. I am receiving calls from myself.

When on a app it will freeze and than not even allow me to close the app.

What is going on and how can I get this fixed?!!! My phone is not even a year old.

running on a iPhone 7

upgraded to ios13

and Reminders app

is Useless Frustrating and DOES NOT Work

takes 5+ minutes to accept input

but does nothing

won’t take input

does not sync across devices

ever thing else is fine but want the Old reminders back

how can I do that?

I inadvertently upgraded the reminder App. and now I cannot seem to find it on one of my family's phone. I want to switch back and don't have a clue how to do it. I cannot believe the degree of difficulty in the learning curve in changing from an older IMAc to a new MAC. Its really frustrating for almost everyone and seems to me that Apple has totally outsmarted the same people it sells to. I understand I am held hostage for life as you control my music and photos, but for God's sake, make things much more simple.

Apple isn't here, only users like you. Complaining to us won't do any good.

Apple products feedback links - http://www.apple.com/feedback/