Please go to your iPhone “settings”, and tap “Sekai Camera” to check your version information.

Yes, you can. You can save as many Air Tags as you wish in your pocket.
The Air Tags in your pocket are more like a bookmark rather than a copy. So you can also keep the same Air Tags several times in your pocket.
If an Air Tag is deleted, it will not disappear from the list in the pocket, but you will not be able to tap on it to see the details.

As long as an Air Tag is not deleted, it will remain in our systems and be displayed indefinitely.
The original Air Filter settings are set to show Air Tags posted within the last week, but by changing the settings, you will be able to see all past Air Tags.
However, some Air Tags may not be displayed depending on how densely populated the location is – if there are many Air Tags, we prioritize to display newer ones over old.

If you have either a 3G or WiFi connection and are able to update your location with a GPS, Sekai Camera can be used all over the world.
However, please note that data-roaming and other connection methods outside your home country may be very costly.

He is the “guide to the world of dreams beyond cameras”. He doesn’t have a name yet.