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2. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) A SIM (Subscriber Identity Module) card is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).

3. Mobile phone operator - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone_operator

   A mobile phone operator, wireless provider, or carrier is a mobile telecommunications company that provides wireless Internet GSM services for mobile device users. The operator gives a SIM card to the customer who inserts it into the mobile device to gain access to the service.

4. Prepaid mobile phone - Wikipedia

   en.wikipedia.org/wiki/Prepaid_mobile_phone

   Credit card, debit card, [1] or online payment processors. Direct draw from bank account using an ATM [2] [3] [4] Retail store purchase with a "top-up" or "refill" card at retail. These cards are stamped with a unique code (often under a scratch-off panel) which must be entered into the phone in order to add the credit onto the balance.

5. GSM - Wikipedia

   en.wikipedia.org/wiki/GSM

   A nano sim used in mobile phones. One of the key features of GSM is the Subscriber Identity Module, commonly known as a SIM card. The SIM is a detachable smart card [2] containing a user's subscription information and phone book. This allows users to retain their information after switching handsets.

6. Mobile phone - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone

   The first SIM card was made in 1991 by Munich smart card maker Giesecke & Devrient for the Finnish wireless network operator Radiolinja. [citation needed] A hybrid mobile phone can hold up to four SIM cards, with a phone having a different device identifier for each SIM Card. SIM and R-UIM cards may be mixed together to allow both GSM and CDMA ...

7. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!