CDMA iphones come preloaded with bundles for verizon and sprint. The 4s comes with a bunch more bundles than the 4. Sprint iPhones come programmed to use the sprint_us bundle and verizon iPhones use the Zeppelin_us.

How and what determines which bundle the iPhone will use? Say i want the iPhone 4s to use the tmobile, att or the zeppelin bundle - what procedure activates bundles?