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.
Without a SIM card, a GSM phone wonât be able to connect into any mobile network. The card is what holds all of the critical information. Each Sim contains a IMSI (International Mobile Subscriber Identity) and a authentication key that validates the IMSI. This authentication key is provided by the carrier. This is what allows your phone to be able to connect to the network & the this is the main purpose of the Sim card. Each SIM card has a unique identifier called the ICCID (Integrated Circuit Card Identifier), which is stored in the card and engraved upon it.