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Samsung

Guides for Samsung Galaxy M21s

520 guides

Storage & Backup2

Back Up Data to Samsung Cloud

A phone that gets lost, stolen or bricked takes any local backup with it. If contacts, photos or app data only exist on the device itself, a factory reset or hardware failure wipes them for good. Backing them up to your Samsung account keeps a copy safe outside the phone.

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Other2

Change Edge Lighting Effects and Colors

By default, Edge lighting shows new notifications with a blue spotlight effect no matter which app sends them. That makes it hard to tell notifications apart without unlocking the screen. Samsung One UI offers several alternative effects and a full color picker to fix that.

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Apps & Installation2

Install an App from the Google Play Store

On a Samsung phone you can install apps through the Google Play Store or through Samsung's own Galaxy Store, and it is not always obvious which one to use for a given app. The Play Store covers most mainstream apps, while some Samsung-specific tools only show up in the Galaxy Store. Picking the wrong store or getting stuck on the search results is the most common reason an install never starts.

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Display & Home Screen2

Adjust Display Brightness

If your Samsung screen stays too dim or too bright no matter the lighting, the brightness slider might be locked to Adaptive brightness instead of manual control. This drains the battery faster and makes reading outdoors or at night harder than it needs to be. Switching to manual brightness gives you direct control over how much power the display uses.

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Calls & Messages2

Add an Account to Calendar

If your appointments, birthdays or tasks from Google or Exchange are missing in the Calendar app, the account simply has not been linked yet. Samsung Calendar only shows data that is stored on your phone or connected through a synced account, so an unlinked account leaves whole calendars empty.

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Photo, Video & Media2

Restore Deleted Photos from Gallery Trash

A photo or video you thought was gone might still be recoverable on your Samsung phone. The Gallery app keeps deleted files in a hidden Trash folder, but only for a limited time before they are wiped for good. If the recycle bin was switched off or the file is older than the retention window, recovery is no longer possible.

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Photo, Video & Media2

Reset Camera Settings

If your Samsung camera keeps producing odd results after tweaking resolution, filters, grid lines or shooting modes, restoring the default configuration usually clears the mess fastest. Custom settings like exposure values, watermark options or scene assist can silently stack up and cause blurry, oversaturated or oddly cropped shots. Resetting the camera app wipes every custom option but leaves photos and videos you already captured untouched.

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Other

Edge Lighting Display Timing

Edge lighting fires for every notification, whether you are actively looking at the screen or the phone is locked in your pocket. If the glow feels excessive or you barely notice it, the timing setting decides whether it shows during active use, only when the display is off, or in both cases.

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Other2

Change Font Style

If every menu, notification, and app on your Galaxy phone still shows the same default typeface, the system font hasn't been changed yet. Samsung ships built-in alternatives like 'SamsungOne' and 'Gothic Bold', and the Galaxy Store offers more fonts to download or buy. Until you adjust this setting in Display, the interface keeps the factory look everywhere.

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Photo, Video & Media2

Create a Custom Photo Album

New photos and videos land automatically in fixed albums like Camera or Downloads, depending on which app saved them. If you want to keep certain pictures together instead - for a trip, a project, or a specific person - the built-in sorting will not do that for you. Gallery lets you set up a separate album and move or copy pictures into it manually.

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Storage & Backup2

Unmount SD Card Safely

Pulling the memory card out of your Samsung phone while it is still active can corrupt files or wipe data that has not finished syncing. The system needs to release the card first, otherwise apps that store data on it may crash or lose access. A software glitch on the phone can also block the card from unmounting cleanly, leaving you unsure if removal is safe.

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Calls & Messages2

Answer Calls Automatically

When your Samsung phone is paired with a Bluetooth headset, car kit, or hands-free device, incoming calls should connect the instant you accept them through the accessory. If Answer automatically stays off, you still have to tap the screen manually, which is awkward while driving or wearing a wired headset. The same setting also controls how many seconds pass before the call picks up on its own.

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Photo, Video & Media2

Rename an Album in Gallery

When you try to give a photo album a clearer name on your Samsung phone, the option sometimes seems to be missing. This usually happens because system albums like Camera or Downloads cannot be renamed at all. Albums you created yourself or that come from an app can be renamed without any restriction.

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Other2

Turn Custom Watermark On or Off

Photos taken with your Samsung camera carry no signature or text, even though a custom watermark would help identify your shots. The built-in watermark stamps text into the lower left corner of every photo, but its position is fixed and the small camera icon next to it can't be removed. That limits how much you can customize the look before it gets applied.

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Notifications & Focus2

Set Up Focus Mode

If your phone keeps buzzing with app notifications while you are trying to work or unwind, the culprit is usually that every app has free access to your screen. Focus mode on Samsung phones can shut off everything except the apps you actually need for a set stretch of time. Without setting it up properly, you either lock too much or nothing at all, which makes the feature feel useless.

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Language & Input2

Change Keyboard Theme

The Samsung keyboard ships with a light design that can feel too bright when you type at night or in low light. Switching to a dark design keeps the letters legible without lighting up the whole screen. An adaptive theme goes further and matches the keyboard color to whatever app you have open.

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Notifications & Focus

Turn Off Camera Shutter Sound

Every photo you snap on a Samsung phone triggers a loud shutter click, even when the ringer is off. Samsung does not offer a dedicated toggle for this release sound inside the Camera app, so many owners assume it is stuck on permanently. The fix actually lives in the system media volume, not in the camera settings themselves.

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Apps & Installation2

Schedule Update Installation

Not every firmware update on your Samsung phone has to go in right away. Installing it in the middle of the day means the restart interrupts whatever you're doing. Samsung lets you pick a time within the next 24 hours so the install and restart happen automatically when you're not using the phone.

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Photo, Video & Media2

Turn Show Palm On or Off for Selfies

If your Samsung camera keeps snapping photos every time you raise an open hand, the 'Show palm' gesture is reacting to more than just selfies. This automatic gesture starts a three-second timer whenever it detects a raised palm, which can trigger unwanted shots in group photos or video calls. Turning it on or off only takes a few taps inside the camera settings.

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Network & Connectivity2

Turn Bluetooth On or Off

If your Samsung phone keeps reconnecting to a car stereo or speaker you did not want right now, Bluetooth is still active in the background. Leaving the radio running also uses a small amount of battery even with nothing paired. Switching it off stops these automatic reconnections until you turn it back on.

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Security & Privacy2

Change System Settings App Permission

If an app suddenly stops adjusting screen brightness, auto-rotate, or sound profiles on its own, it may be missing the Change system settings permission on your Samsung phone. Blocking this permission stops those automatic adjustments but never touches lock screen or biometric security, since Samsung keeps those separate. You decide per app whether it keeps this special access.

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Notifications & Focus2

Vibrate While Ringing: Turn On or Off

If your Samsung phone stays silent on the desk during an incoming call, the vibration for ringing is switched off in your sound settings. This toggle controls only the ring vibration, separate from notification vibration or Do Not Disturb rules. Missed calls at work or in a bag often trace back to this single setting.

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Calls & Messages2

Show or Hide Declined Events in Calendar

If a meeting you declined still disappears from your calendar view instead of showing as declined, the Samsung Calendar app is hiding it on purpose. This happens because the 'Hide declined events' option is turned on by default, which removes any event you rejected from the schedule entirely. Once you know where that switch lives, you can bring those events back into view whenever you need a full record of your invitations.

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Network & Connectivity2

Set Default SIM Card for Calls

If your Samsung phone keeps dialing out from SIM 1 even though you meant to call from SIM 2, the default call SIM is likely locked to the wrong card. You can also set the phone to ask every time before placing a call, which helps when you keep one SIM for work and one for personal contacts. This same setting can be changed directly from the status bar shortcut, not just deep inside the settings menu.

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