Is Jailbreak a must?

Yes, Jailbreak is still necessary because Apple barred the access to the data area by default.

For details about Jailbreak, please visit: http://www.iclarified.com/entries/index.php?caid=2&scid=11&seid=2

Nevertheless, I do *NOT* mean to suggest, encourage, influence, convince or attract you to jailbreak your iPhone.