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You can spend $99/yearly and become an iPhone developer. Then you can put whatever you want on your iPhone (I assume iPad development will be similar). Ad-hoc distribution allows for like 500 "testers", and you could always just share source files with other developers and recompile them.

EDIT: thanks for the correction on yearly vs. one-time.

Only if the SDK supports it. I can't, for instance, put widgets on the lock screen to see how many unread emails I have. Or have the locked device light up due to an event that my background process detected.

You probably can, if it's just for yourself.

The jailbreaking world has reverse engineered a lot of these internals, like replacing SpringBoard, etc.

" It could be $99/yearly."

It is.

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