WhatsApp for Xperia 1 (2019)

WhatsApp compresses images sent through chats, so the limitation is the app and not the Xperia 1's triple camera. To keep full resolution, open the chat, tap the attach (paperclip or +) icon, choose Document instead of Gallery, and send the photo as a file so it isn't recompressed. You can also raise everyday quality under WhatsApp > Settings > Storage and data > Media upload quality > Best quality. See how others solved this on Reddit

The Xperia 1 runs Android 11 (its final update) on a Snapdragon 855 with 6GB of RAM, which still handles WhatsApp calls, media and backups smoothly for everyday use. The main caveat is that it no longer receives Android security patches, so keep WhatsApp itself updated via the Play Store and be cautious with sensitive banking apps. Battery life from the 3330mAh cell is the weakest point, so enable STAMINA mode in Settings > Battery to stretch a full day. See how others solved this on Reddit

The Xperia 1's 21:9 CinemaWide display is taller than most apps expect, so shared clips and video calls often show letterboxing. This is normal, not a fault, because the apps are built for 16:9 and the extra height simply stays empty. You can try to force a wider fill per app via Settings > Display > Aspect ratio (App display settings), but for WhatsApp leaving it at the default avoids stretched, distorted faces during calls. See how others solved this on Reddit

Sony's STAMINA mode and battery optimisation can close WhatsApp in the background, delaying or dropping notifications. Go to Settings > Apps > WhatsApp > Battery and set it to Unrestricted, then under Settings > Battery > STAMINA mode add WhatsApp as an exception. Finally confirm alerts are on under Settings > Apps > WhatsApp > Notifications so chats notify you reliably. See how others solved this on Reddit

With 6GB of RAM the Xperia 1 holds WhatsApp alongside a few apps fine, but heavy multitaskers may notice WhatsApp reloading after switching away. Reduce the strain by clearing WhatsApp's cache via Settings > Apps > WhatsApp > Storage > Clear cache, and close unused apps from the recents view. Cutting back on live wallpapers and widgets also frees memory so WhatsApp stays resident and notifications arrive promptly. See how others solved this on Reddit