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To update WhatsApp, navigate to App Store > Updates, under the lists, find the app to update it to the latest. Thus, to fix the WhatsApp not opening on your iPhone/iPad, please update the app and your device to the latest version. Sometimes, an incompatible version of both an app and a device would cause some unknown problems.
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To close WhatsApp, simply press down the Home button on your iPhone/iPad or just launch the control center, next all apps including the WhatsApp running in the background will appear, then swipe them up to remove and after a while, open WhatsApp on your device to see whether the trouble still exists. When the WhatsApp can't be opened on your iPhone or iPad, you could try to first force quit the app and then restart it. Way 1: Relaunch WhatsApp Way 2: Update WhatsApp and iPhone/iPad Way 3: Reinstall the app Way 4: Reboot iPhone/iPad Way 5: Switch Wi-Fi to cellular data Way 6: Reset network settings Way 7: Fix WhatsApp not opening on iPhone/iPad without data loss Way 8: Free up storage space Way 9: Reset all settings (Data loss) Way 10: Contact WhatsApp support Way 1: Relaunch WhatsApp
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