Will iPhone work with my PC and Microsoft Windows?
Yes. iPhone works with Windows XP Home or Professional (SP2), and Windows Vista. See specifications for more details.
Can I use my iPhone internationally?
iPhone is a quad-band GSM phone and will work around the world. Before you travel, make sure that international dialing and roaming are enabled through AT&T and that the places you’re going offer GSM coverage. Visit AT&T help for more information.
What email systems does iPhone support?
iPhone supports the most popular email standards — IMAP and POP3. Check with your email provider to make sure the provider uses these standards. iPhone works with most popular email services, including Yahoo! Mail, Google Gmail, AOL, and .Mac Mail. Yahoo! Mail supports “push” email and can automatically deliver new email messages to your iPhone.
What kind of security features does iPhone offer?
You can protect access to information on your iPhone with a four-digit password, which is then required whenever iPhone is turned on or wakes from sleep. For secure Internet access, iPhone supports industry-standard Wi-Fi security and virtual private networking (VPN).
How do I charge my new iPhone?
Like an iPod, your iPhone charges using the included USB 2.0 cable connected to your computer or to the included USB Power Adapter.
When does iPhone sync my contacts and calendar?
iPhone syncs your contacts and calendar whenever you connect iPhone to your computer.
Can I view regular websites on iPhone or just mobile websites?
With the Safari web browser on iPhone, you can surf websites just as you do on your personal computer. You’re not limited to mobile WAP sites.
Can I surf the web on iPhone without a Wi-Fi connection?
Yes. When a Wi-Fi connection is not available, you can access the Internet using AT&T’s EDGE data network.
How does iPhone send and receive email?
iPhone sends and receives email over Wi-Fi and EDGE wireless networks.
Can I send and receive email from more than one account?
Yes. You can send and receive email from multiple email accounts on your iPhone.
What types of email attachments can I view on iPhone?
iPhone displays most picture attachments (JPEG, GIF, and TIFF) in-line with the text in email messages. iPhone can also view PDF, Microsoft Word, and Microsoft Excel email attachments.
Can I “unlock” iPhone and use it with another wireless carrier?
AT&T is the exclusive wireless carrier for iPhone in the United States. If you currently use another wireless carrier, you can choose to transfer your number when you activate your AT&T account.
source:http://www.apple.com