WhatsApp for Samsung Galaxy On7

The Galaxy On7 runs an old Android version, so the Play Store may serve an outdated WhatsApp build that loops on the expiry screen. Open the Play Store, search WhatsApp and tap Update; if no update appears there, download the current APK directly from whatsapp.com/android and install it over the existing app (your chats stay intact). If the loop still continues, your Android version is likely now below WhatsApp's minimum supported level, which can only be fixed by moving to a newer phone. See how others solved this on Reddit

This means an unofficial/modified WhatsApp (like GB WhatsApp or WhatsApp Plus) is installed, which WhatsApp now detects and bans. If you can still open the app, back up your chats to Google Drive first, then uninstall the modded version completely and install the genuine app only from the Google Play Store or whatsapp.com/android. If you are temporarily banned, wait out the timer shown on screen before logging in again with the official app. See how others solved this on Reddit

Background sync and WhatsApp's persistent connection can drain the On7's older battery. Go to Settings > Apps > WhatsApp > Battery and set it to Optimized or Restricted, and inside WhatsApp open Settings > Storage and data and turn off auto-download on mobile data. If drain continues while idle, also open Settings > Apps > WhatsApp > Mobile data and disable Allow background data usage to stop it syncing in the background. See how others solved this on Reddit

WhatsApp re-encodes and compresses videos when sending, which can shift colors and saturation regardless of the phone. To keep the original quality and color, send the clip as a Document instead of through the gallery icon (tap the paperclip > Document) so it is delivered without WhatsApp's compression. Trimming the clip shorter or recording at a lower resolution also reduces the heavy re-compression that causes the color shift. See how others solved this on Reddit

Corrupt-file errors usually mean the download was interrupted or the On7's storage filled up mid-transfer. Free up space in Settings > Device care > Storage, then ask the sender to resend so it downloads fully and tap the file again to retry. If it still fails, clear WhatsApp's cache under Settings > Apps > WhatsApp > Storage > Clear cache before re-downloading. See how others solved this on Reddit

WhatsApp has no standalone watch app, so on a Galaxy Watch paired to your On7 you can only see and reply to notifications relayed from the phone. Make sure notification mirroring is enabled in the Galaxy Wearable app on the On7 and that WhatsApp is allowed in that notification list. The phone must stay connected and WhatsApp must be running in the background for the watch to show and answer messages. See how others solved this on Reddit