App
I have downloaded the app before 2 years and still it on my phon put not available on App Store .
how can I share it to my anther iPhone ?
Did you try transferring it from old phone?
Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support
Do you have a back-up that includes the App?
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
If those don't work, you will have no way to download it if it has been deleted from the App Store.