My iPhone software update disconnected my WiFi
My iPhone soft were update time disconnected WiFi so hang my phone now what do I
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Troubleshooting Wi-Fi issues in IOS
Try a restart.
Restart your iPhone, iPad, or iPod touch
Try a forced restart.
If necessary
Do a backup and try a factory reset. Then restore from your backup.
Backup - Restore your device from an iCloud or iTunes backup