You can do this app-side by checking the version versus what's in the app store via itunes webservice. For example: http://stackoverflow.com/questions/2221436/c

You can do this app-side by checking the version versus what's in the app store via itunes webservice. For example: http://stackoverflow.com/questions/2221436/can-i-force-an-iphone-user-to-upgrade-an-application http://stackoverflow.com/questions/2221436/can-i-force-an-ip... I don't recommend that unless you have a mission critical bug, and even then I'd discourage it. A user is in charge of his/her device. I version APIs on the backend and then simply push out updates like any other software. If they choose not to use it then not much I can do. Eventually I'll turn the older API versions off and they'll either have to upgrade or stop using the app.