WhatsApp for OnePlus 7

OxygenOS's aggressive memory and battery management can freeze apps like WhatsApp and Chrome when you switch between them. Go to Settings > Apps > WhatsApp > Battery and set it to Don't restrict (allow background activity). Then open Settings > Battery > Battery optimization, find WhatsApp and set it to Don't optimize, and in Settings > Battery > More (advanced) turn off Sleep standby optimization. A reboot after changing these usually clears up the stuttering. See how others solved this on Reddit

Background activity and media auto-downloads are the usual cause of WhatsApp heating the OnePlus 7. Open WhatsApp > Settings > Storage and data and turn off auto-download for photos, audio, video and documents on mobile data and Wi-Fi. If heat persists, go to Android Settings > Apps > WhatsApp > Storage and clear the cache (this does not delete chats), then reboot. Keeping WhatsApp updated also helps, since older builds had known wakelock and battery-drain bugs. See how others solved this on Reddit

This is a known OnePlus 7/7 Pro proximity sensor quirk where the screen stays black after a call. First remove any screen protector overhang and clean the top of the display near the earpiece, since dust or a protector edge throws the sensor off. Then make sure OxygenOS is fully updated, as several updates addressed proximity-sensor behavior. If it still misreads, reboot the phone; if the fault continues, the sensor may need recalibration via OnePlus support, as there is no reliable user-facing calibration toggle on this model. See how others solved this on Reddit

OxygenOS puts apps to sleep to save power, which silences or delays WhatsApp notifications. Go to Settings > Apps > WhatsApp > Battery and set it to Don't restrict (allow background activity), then in Settings > Battery > More turn off Sleep standby optimization. Also confirm WhatsApp > Settings > Notifications has notifications enabled with High priority, and that Android's Do Not Disturb isn't blocking them. See how others solved this on Reddit

WhatsApp's iCloud backups can't be restored directly onto Android, so the two backup systems aren't compatible. The official path is WhatsApp's Move to Android feature: factory reset (or set up fresh) the OnePlus 7, then during WhatsApp setup connect the iPhone with a USB-C cable and follow the on-screen Move to Android prompts. If your OnePlus build doesn't support it, you'll need a reputable paid third-party transfer tool, as manual iCloud-to-Google-Drive migration isn't supported. See how others solved this on Reddit

Restores fail when the Google account on the new phone doesn't match the one that made the backup, or when the verified phone number differs. During WhatsApp setup, verify the same phone number and sign in with the exact Google account used for the original backup, and make sure that account is added under Settings > Accounts on the OnePlus 7. A stable Wi-Fi connection is required, and the restore prompt only appears at the right step of setup, so don't skip it. See how others solved this on Reddit