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2. Dual SIM - Wikipedia

   en.wikipedia.org/wiki/Dual_SIM

   A dual SIM tray as shown on a Redmi 13. This phone accepts either two nano SIMs or a nano SIM and a MicroSD card in place of the second SIM slot. Some telephones have a primary and a secondary SIM slot that support different generations of connectivity. For example, 4G and 3G primary, and 3G and 2G secondary, [29] or 5G and 5G, or 5G and 4G. [30]

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. Samsung Galaxy A21s - Wikipedia

   en.wikipedia.org/wiki/Samsung_Galaxy_A21s

   The Samsung Galaxy A21s has a four camera setup arranged in an "L" shape located in the corner with a rectangular protrusion similar to that of the iPhone 11 and the Pixel 4. The array consists of a 48 MP wide angle camera, an 8 MP ultrawide camera, a 2 MP macro camera , and a 2 MP depth sensor. [ 3 ]

5. Samsung Galaxy Duos - Wikipedia

   en.wikipedia.org/wiki/Samsung_Galaxy_Duos

   Each SIM card in a Samsung dual SIM phone can be set to on or off independently in the top section of the SIM card Manager menu. When both are set to ON, then both can connect incoming calls, but only one at a time. If SIM 2 is in use, a caller to SIM 2 will be redirected by the carrier network as though the phone were off or out of range.

6. Samsung Galaxy S21 - Wikipedia

   en.wikipedia.org/wiki/Samsung_Galaxy_S21

   The lineup of the first three devices was unveiled at Samsung's Galaxy Unpacked event on 14 January 2021. The three devices served as the successors of the 2020 models. All devices' design scheme has changed drastically, redesigning the massive rear-camera module for a slimmer camera module incorporated with the buttons and a uniform appearance for the S21, S21+, and S21 Ultra.

7. QVC's Samsung Galaxy A21 for $85 might be the best ... - AOL

   www.aol.com/lifestyle/qvcs-samsung-galaxy-a21-85...

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