Update iPhone apps from overseas App Store regions—no need to switch accounts

A fun fact: when updating apps downloaded with overseas-region accounts, you don’t actually need to switch accounts every time inside the App Store.
You can try this path:
Settings → Calendar / Contacts / Reminders → Accounts → Add Account → iCloud, and add your own overseas-region Apple ID (US, JP, etc.).
After that, for some apps you previously downloaded with overseas accounts, the system may recognize them directly during updates, so you won’t have to keep switching App Store accounts.
Note two things:
· Only add your own accounts.
· If you don’t need to sync calendar, contacts, and reminders, remember to turn them off to avoid mixing data.