WhatsApp for LG K8 (2018)

Wi-Fi calling on the K8 (2018) only appears if your carrier and the carrier-branded firmware enable it. Check Settings > Networks > Call (or Settings > Networks > Mobile networks) for a Wi-Fi Calling toggle. If that toggle isn't there, your unlocked or unsupported variant won't get it, and the practical workaround is to place voice calls over WhatsApp, Signal, or your carrier's own calling app instead. See how others solved this on Reddit

With only 2GB of RAM and Android 7.1, the K8 (2018) struggles once apps and chat history grow. Free up space in Settings > General > Storage by clearing cached data, and in WhatsApp open Settings > Storage and data > Manage storage to delete large media. To make it feel snappier, unlock Developer options via Settings > General > About phone > Software info, then tap Build number seven times; go back to Settings > General > Developer options and set Window animation scale, Transition animation scale, and Animator duration scale to 0.5x. See how others solved this on Reddit

The 16GB of internal storage fills fast, which blocks installs and media downloads. Open Settings > General > Storage to see what's using space and clear app caches, then in WhatsApp go to Settings > Storage and data > Manage storage to delete forwarded and large files. Also turn off auto-download under WhatsApp Settings > Storage and data so new photos and videos stop filling the phone. Moving existing photos to a microSD card via a file manager frees more room. See how others solved this on Reddit

That is Factory Reset Protection, triggered because the device was wiped without first removing the Google account, and it blocks setup until you sign in with the original account that was on the phone. Enter that original Google email and password to continue. To avoid it next time, remove the account first via Settings > General > Accounts & sync > Google > (account) > Remove account before doing the reset. See how others solved this on Reddit

The K8 (2018)'s entry-level Snapdragon 425 and 2GB of RAM are fine for WhatsApp, calls, and light browsing but will stutter or crash on demanding games and heavy multitasking. Keep background apps minimal by closing them from the Recents key, and if an app force-closes, clear its cache under Settings > General > Apps > (app) > Storage > Clear cache rather than expecting smooth heavy gaming. See how others solved this on Reddit

Background sync and screen-on time drain the modest 2500mAh battery. Turn on Settings > Battery & power saving > Battery saver to cap background activity, and lower brightness and screen timeout under Settings > Display. You can also restrict an app's background data in Settings > General > Apps > (app) > Mobile data, and limit chatty apps via Settings > Networks > Data usage so the phone isn't constantly waking up. See how others solved this on Reddit