iPhone app cannot be installed because its integrity could not be verified.

What are you questioning? The message? Or the language in which it appeared? If it is the message, this is an English speaking community and most of us are unable to read the message.

Google translation: This app cannot be installed because it failed check its integrity.

Worded by Apple in English as: This app cannot be installed because its integrity could not be verified.

While I can find plenty of web sites with the matching phrase of other users seeing the same message, I couldn't find a solution.

Thank you for the translation. It’s a questionable app and Apple won’t allow its download. This is to protect users and their data from deceptive apps. I don’t know of any work around and personally would not want to try it on my iPhone. Others may have different opinions. Have you tried contacting the developers of that app?

Normally you only see this kind of message on a Mac, and there you would go to security settings to allow it if you still wanted too. An iPhone can only use the App Store, and I would think any app with such a warning would never be allowed in there.

Hello ~ Would that be the case if iPhone were jailbroken?

~Katana-San~

Thank you for the translation.

My response was to the OP (Original Poster - the person who started the topic), but you're welcome.

It’s a questionable app and Apple won’t allow its download. This is to protect users and their data from deceptive apps.

Yes, I'm aware of the reason for the message.

I don’t know of any work around and personally would not want to try it on my iPhone.

That's the confusing part of this topic. The OP posted in the Using iPhone forum, and only lists an iPhone 13 as their device. But as Tom noted, this isn't a message you'd see in iOS. Only on a Mac. Even if the phone were jailbroken as Katana-San noted, you still wouldn't see such a message in iOS.

But even then, the message you normally get for an unsigned app is, "Cannot be opened because it is from an unidentified developer." The message also doesn't automatically mean the app is dangerous. It simply means it doesn't have an Apple vendor ID. That is, the author of the app didn't want to pay Apple the $100 per year fee to be able to have that information included in their compiled app. If you know it's safe, you can right click on the app and choose Open. You'll get one more chance to change your mind. If you proceed, the OS will never complain about that app again and open it the same as any trusted software from then on.

But I read somewhere that in a near future release of macOS, such apps will simply not be allowed to run. Period. The developer either pays the fee in order to code-sign the app (regardless of whether it's in the App Store or not), or the user won't be able to run it.