Translate this from German to English?

I'm buying stuff on ebay and I found this description. Can someone translate it please?

Verkaufe ich ein neues Iphone 4s in Weiss mit 16GB ohne Simlock (Offizielle Apple)
völlig neue
Apfel verändert mit einer neuen während der Garantiezeit
Handy mit Kunststoff-Schutz
nie benutzt
Apple-Garantie bis 02.02.2013

Lieferung am Tag nach der Zahlung per Paypal
Empfang: in 3/5 Tage
Alle Rechnungen werden verschickt.

Can i code iphone apps on windows?

I'm interested in starting to code my own apps and as i'm learning how to start, iDownload Xcode from the Mac App store on a Mac. Does this mean Xcode is available only on a mac pc?

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I got large space of memory taken by "other", which is shown in itunes. I checked my usage in my iphone and i found that 5.2GB of memory were used up by photos. I try to delete it but failed.

i tried to restore my iphone and backed up, but it seems the "other" does go away.

Note: Iphone 4s IOS 6.1 Please forgive my poor english.

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Is this an Iphone scam on ebay?

I was looking to by an Iphone 4s. I found one for 300 but it says New, missing original box, box says 32gb but is only 8gb. But the item name is Apple Iphone 4s White at&t 16gb. Is that a scam?

Can I use my iPhone SIM card in another phone (AT&T)?

I have an iPhone 4 on an AT&T family plan. I'd like to purchase a phone outside of AT&T. Can I simply take the SIM card out of my iPhone and put it in the new phone (some no-name-brand Android phone from Hong Kong)?

Alternatively, is there a way to add any old phone to my AT&T account or do I have to purchase one of their phones.