This makes the browser display a login prompt, but it doesnât display any other text thatâs in the response. (It only displays that response text if the user clicks âCancelâ.) When the user enters some credentials, the browser resubmits the same request to the same URL, plus it also adds this extra header: Authorization: Basic username:password. Note that the username:password bit is actually Base-64 encoded.
Sim card hold contacts, so pretty much everything will remain on your phone besides your contacs and your MEID which is your phone number.
Use. The SIM card is provided with your iPhone (or 3G iPad) by your carrier and it is used to store data about your account. It holds information such as your phone number, security data, billing information and things which help the carrier to know who is the user of the phone.