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Sometimes the iOS device will not connect to the available WiFi automatically, but it will if Safari is launched and try to browse to any site (or go to Settings->Wi-Fi and select the desired network). This is probably for battery savings reasons.
How to trigger this from your app?
The higher level Cocoa Touch network APIs will attempt to turn on the radios if needed. Until then they are kept off as much as possible to conserve battery power (after certain time-outs).
Safari probably uses one of the high level HTTP APIs for browsing.