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2. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   The company will then provide the unlock code for the handset. For some brands such as Nokia and Samsung various services also offer special remote-unlocking software with instructions, where a cable is needed to remove the SIM lock at home. Such companies may email the unlocking code or software which will remotely unlock the device.

3. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) 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).

4. SIM box - Wikipedia

   en.wikipedia.org/wiki/Sim_box

   SIM box operators often swap SIMs to replace restricted ones. They may also rewrite the International Mobile Equipment Identity (IMEI) of the SIM box, often using randomized IMEIs in ranges of or those assigned to common mobile phones to evade detection. The use of SIM boxes is often legal, but the use may constitute breach of carrier contracts.

5. Personal unblocking key - Wikipedia

   en.wikipedia.org/wiki/Personal_unblocking_key

   If the wrong PIN is entered more than three times, the SIM card will become locked. It can be unlocked by entering the PUK code provided by the mobile service provider, [1] which may be available on the SIM card's packaging, the contract, or provided by customer service after identity verification. After the PUK code is entered, the PIN must be ...

6. Prepaid mobile phone - Wikipedia

   en.wikipedia.org/wiki/Prepaid_mobile_phone

   Through electronic reloading where a specially designed SIM card is used to reload a mobile phone by entering the mobile number and choosing the amount to be loaded. This process is widely implemented in the Philippines and India so that any person can be a prepaid load retailer, creating a nationwide availability of reloading stations, even in ...

7. Removable User Identity Module - Wikipedia

   en.wikipedia.org/wiki/Removable_User_Identity_Module

   KDDI's au IC-Card Sierra Wireless AirCard 555R PC Card wireless modem for the China Unicom network with R-UIM interface (extension at the front). Removable User Identity Module (R-UIM, usually pronounced as "R-yuim") is a card developed for cdmaOne/CDMA2000 ("CDMA") handsets that extends the GSM SIM card to CDMA phones and networks.

8. TUFF Phones - Wikipedia

   en.wikipedia.org/wiki/TUFF_Phones

   Certain generations of TUFF phones have implemented a removable tray that allows for the installation of two nano SIM cards; which allows the user of the phone to make use of two different phone numbers for calling and texting for example, or one nano SIM card with one microSD card; which allows the user of the phone to use a single phone number and to increase the amount of storage capacity ...

9. Nokia Asha 300 - Wikipedia

   en.wikipedia.org/wiki/Nokia_Asha_300

   The Nokia Asha 300 is a cell smartphone which was first released in November 2011. Specifications include a 2.4-inch touch screen, 5 MP camera, Radio FM, MP3 support, a microSD memory card slot and a 24-day standby time, making it one of the leading phones on the market of its time for battery life.