WhatsApp for Samsung Galaxy S6 edge+ (CDMA)

On a phone this old the sealed battery has lost much of its original capacity, so reduce background drain first: go to Settings > Apps, tap each heavy app, open Battery and set it to Optimize, and turn off Bluetooth, Wi-Fi, and NFC under Settings > Connections when you aren't using them. Disabling pre-installed Samsung and carrier apps you never open (Settings > Apps > tap the app > Disable) cuts a surprising amount of standby drain. If it still dies midday, a battery replacement from a repair shop is the only real fix, since the S6 edge+ battery is not user-removable. See how others solved this on Reddit

The S6 edge+ stopped getting Samsung security patches years ago (its last OS was Android 7 Nougat), so treat it like any unsupported device: avoid sensitive logins such as mobile banking and install apps only from the Play Store. Keep Google Play Protect on (open the Play Store, tap your profile, then Play Protect), since Google's security scanning continues independently of Samsung's firmware updates. Many owners run these old Galaxy phones for years as a secondary or media-only device, which is the safest way to keep using one. See how others solved this on Reddit

Free up storage first, since the S6 edge+ slows badly when nearly full: open Settings > Device maintenance > Storage, clear cached data, then move photos to Google Photos and delete the local copies. Reducing animations helps too: tap Build number seven times under Settings > About phone to unlock Developer options, then set the three animation scales to 0.5x so the UI feels snappier. If it stays sluggish, a factory reset (Settings > Backup and reset) after backing up to your Google account usually restores most of the original speed. See how others solved this on Reddit

The dual-curved display is prone to edge mis-taps, so turn on Settings > Display > Accidental touch protection, which ignores touches when the phone senses it is in a pocket or bag. You can also turn off the Edge panels and Edge lighting under Settings > Display > Edge screen so the curved areas aren't listening for swipes. A case with a slightly raised lip around the edges physically reduces stray palm contact, especially during calls. See how others solved this on Reddit

Sign in under Settings > Accounts > Google and turn on sync for Contacts, then install Google Photos and enable Back up & sync so every picture uploads to your Google account automatically. Once that finishes, signing into the same Google account on your new phone pulls your contacts and photos down with no cable needed. For app data and text messages to another Galaxy device, use Samsung Smart Switch (Settings > Cloud and accounts > Smart Switch) to transfer directly over Wi-Fi. See how others solved this on Reddit

The S6 edge+ has no microSD slot, so a full 32GB or 64GB of internal storage is a common cause of slowdowns; clear it via Settings > Device maintenance > Storage and offload media to the cloud. Heat usually comes from a stuck or constantly syncing app, so check Settings > Battery for which app is using the most power and force-stop or uninstall it. Avoid charging while gaming or streaming, since the metal-and-glass body traps heat and that accelerates the already-aging battery's wear. See how others solved this on Reddit