Calmsea Said:
"iPhone randomly switching to cellular data with Wi-Fi Assist off"
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Troubleshooting iPhone Wi-Fi and Cellular:
Try The Following the the Order Provided:
I. Start Here: If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support
II. What Else to Try:
A. Restarting the iPhone:
If any changes were made (i.e. Installed Apps), then Settings (i.e Wf-Fi), may have become manipulated technically. So, try restarting the iPhone:
- Go To: Settings
- Tap: General
- Tap: Shut Down
- Slide: Your Finger to the Right
B. Disable Cellular:
Try disabling Cellular, and using Wi-Fi instead, seeing if that makes all the difference. Cellular always overrules Wi-Fi.
C. Try manually restarting your iPhone:
- Go To: Settings
- Select: General
- Scroll to: the Very Bottom
- Select: Shut Down
- Slide Finger: to the Right
- Wait: 30 Seconds
- Power One: the iPhone
- Try this Once More
D. Reset All Network Settings to Default:
Example of items that will be reset: (Wi-Fi Passwords, VPN Connections, etc)
- Go To: Settings
- Tap: General
- Tap: Reset
- Tap: Reset Network Settings.
- Enter: [Your Passcode]