Apple excluded the support for restoring images in 32-bit devices such as iPhone 5 in the very first beta of iOS 10.3.1. So, this should not be a surprise that Apple has removed the support for 32-bit applications in the new iOS 11.
What is happening actually?
In 2013, Apple warned the developers with the introduction of iPhone 5S using a 64-bit A7 processor. Still, there are around 200,000 apps which have not been updated so far to be compatible with new 64-bit devices. If you are using an iPhone with iOS 10.X, and open a 32-bit application, you will get a message saying
This app will not work with the future versions of ios. The developer of this app needs to update it to improve its compatibility.
Your application will work fine in iOS 10.X but not in iOS 11. It would not even open. Instead, it will display the following message
The developer of this app needs to update it to work with ios 11.
How to check for existing 32-bit applications in your phone?
1. Go to Settings > General > About > Applications.
Well, if you tap on Applications and it does not open,
You do not see an arrow next to it,
then there is nothing to worry about. It means that you do not have any 32-bit applications in your phone.
If there is any app that is important to you which features in this list, you should definitely contact the developer to see if the update is being worked upon. To contact the developer, tap on any application and it will direct you to that app’s page on App Store. Scroll down and you will see an option called Developer Website.
Also, if that application is no longer available on App Store, then you need to search for the developer for yourself.
If you have not updated to iOS 11 betas, then you can wait for a while. There is nothing bad in waiting for a while so that all your apps are updated for iOS 11. Because there is no point in updating to iOS 11 if your most-used apps are not being supported.