Is it possible to change the theme, that is, the icons and dock, of the new iPhone OS, without jailbreaking? If not, what does jailbreaking entail, and what are the pros and cons of doing so?

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Hi
Can you help me weigh up the pros and cons of each please…

anyone any experiance with either of these…

Sound performance? durabilty etc etc…

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I am thinking about treating myself to an ipod, but i am completely stuck between choosing the ipod classic 160gb or the 16gb ipod nano. Please could someone tell me the pros and cons of them both to help me decide.

Thanks

Any pros and cons appreciated; I have a year old really simple cell phone, eligible for an upgrade to a different phone. I want an MP3 player for storing and listening to audiobooks mostly, maybe some music. I’m with Verizon and they recommend the Chocolate. What would better – upgrading to a Chocolate (will cost me about 5) or upgrading to a free phone and buy an MP3 player? I’m looking for a 4GB player, and not an iPod. Do MP3 players have docking stations for use as speakers? or are those docking speakers just for iPods?