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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.
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).
In a mobile telephone communication system, a mobile phone number generally corresponds to a SIM card. As soon as a mobile phone user combines the SIM card with the mobile phone, the system is immediately able to identify the user, providing the kind of transmission services and data gathering services required for billing purposes.
Samsung announced the Samsung Galaxy S21 series, consisting of the Samsung Galaxy S21, Samsung Galaxy S21+ and Samsung Galaxy S21 Ultra, on 14 January 2021. They are the first S Series Lineup to feature 5G models only during launch. On 4 January 2022, the Samsung Galaxy S21 FE was released, a mid-range variant of the S21 containing similar ...
It is the first Samsung flagship lineup to have a glass back since the Galaxy S9 and Galaxy Note 9 as previous flagships from 2019-2021 (except the Note 10+ and the original Note 10) used a matte plastic finish similar to the A series. They collectively serve as the successor to the Samsung Galaxy S21 series. The first three smartphones were ...
Physical location. The location of both SIM and memory card slots vary among devices, where they might be located accessibly behind the back cover or else behind the battery, the latter of which denies hot swapping. [240] [241] Mobile phones with non-removable rear cover typically house SIM and memory cards in a small tray on the handset's ...
The Samsung Galaxy M31 is an Android smartphone manufactured by Samsung Electronics as part of the Galaxy M series. It was unveiled on 25 February 2020. [ 3 ] Its key features include a 6.4 inch Super AMOLED display, a quad-camera setup and a 6000 mAh battery.
On recent phone models running Android software, the phone will display a message saying "SIM network unlock PIN" or "Enter Network Lock Control Key" if network locked. Windows phones will display the message, "This SIM card can only be used on specific networks. Contact your customer service center for the unlock code".