Releases, Forced Upgrade, and Versioning

A mobile release does not replace every installed app immediately. Old and new versions may remain active together for months.

Design the service, configuration, and local data formats for those different installed versions.

Separate delivery, activation, and service changes

Binary delivery distributes app code. Feature activation selects which compatible installations use a feature. Service evolution changes backend behavior and API contracts.

These changes should not require every device to update at the same moment