Can I keep my app running continuously in the background? Is it possible to run code in background every 15 minutes?
iOS background execution
Maybe having a server send the app a silent push notification that causes it to perform some kind of routine or operation or read here https://developer.apple.com/documentation/backgroundtasks/bgtaskscheduler
This question is so popular, there’s a whole write-up on it: iOS Background Execution Limits.
No it's just not possible. And trying to send a silent push every 15 minutes won't work either