Quick answer: If android mobile data not working on wifi means your phone is staying on WiFi while traffic is being blocked or misrouted, turn off any VPN/proxy, switch DNS to a public resolver, and test the same site on mobile data only to confirm whether the router or carrier is filtering the connection.
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Most users apply the wrong fix. Use the correct path first.
Quick Fix Checklist
- Turn off VPN and any proxy settings on the Android device.
- Toggle WiFi off and test the same page on mobile data only.
- Set DNS to a public resolver such as 1.1.1.1 or 8.8.8.8.
- Restart the router and check for parental controls, firewall rules, or MAC filtering.
- Check whether the carrier has data restrictions, APN issues, or hotspot filtering.
- Forget and reconnect to the WiFi network to force a fresh route and DNS lookup.
Causes
This problem usually happens when WiFi is connected but the route to the internet is blocked, redirected, or resolved incorrectly. The table below shows the most common network causes.
| Cause | What it means | Fix |
|---|---|---|
| VPN or proxy enabled | Traffic is being sent through a tunnel or proxy that is failing on WiFi | Disable VPN/proxy and retest |
| DNS failure | Android cannot resolve site names even though WiFi is connected | Change DNS to a public resolver |
| Router firewall or filtering | The router blocks specific traffic, ports, or domains | Review firewall, parental controls, and filtering rules |
| Carrier or ISP filtering | Mobile data or upstream routing is restricted by the provider | Test on another network and contact the carrier/ISP |
| Bad WiFi route or gateway | The WiFi network has a broken gateway, captive portal, or routing issue | Reconnect, renew the connection, or reboot the router |
Step-by-Step Fix
- Turn off VPN and proxy settings on Android. Go to your network or VPN settings and disable any active tunnel, then reload the same page.
- Test mobile data only. Turn WiFi off and open the same website or app. If it works on mobile data, the problem is on the WiFi path, not the phone itself.
- Change DNS on the WiFi connection. Set the network to use a public DNS resolver such as 1.1.1.1 or 8.8.8.8, then reconnect and test again.
- Forget the WiFi network and reconnect. This clears a stale gateway, DHCP lease, or DNS assignment that can keep Android on a broken route.
- Restart the router and modem. Power them off for 30 seconds, then bring them back online to clear temporary firewall or routing faults.
- Check router filtering and firewall rules. Look for parental controls, content filters, MAC address filtering, or blocked ports that could stop Android traffic.
- Test another WiFi network. If Android works elsewhere, your home or office router is the likely source. If it fails on every WiFi network, the issue is more likely DNS, VPN, or carrier-side filtering.
- Verify the carrier or ISP path. If mobile data fails only on certain sites or services, ask the carrier whether those domains, ports, or APN routes are being filtered.
Still Not Working
- Use a manual DNS test on WiFi and compare it with mobile data to see whether name resolution is the failure point.
- Disable private DNS temporarily if it is forcing a resolver that cannot reach the target site.
- Check for IPv6-only or dual-stack routing problems on the router; temporarily test with IPv4-only if your router allows it.
- Review any enterprise firewall, captive portal, or guest network restrictions that may block Android traffic.
- Try the SIM in another Android device or test another SIM in your phone to separate carrier filtering from WiFi routing issues.
- Contact the ISP or carrier and provide the exact site, time, and error so they can check upstream filtering or routing failures.
Frequently Asked Questions
Why does android mobile data not working on wifi happen? It usually means WiFi is connected but the route, DNS, VPN, or router filtering is blocking traffic before it reaches the internet.
Can DNS cause android mobile data not working on wifi? Yes. A bad DNS resolver can make Android look connected while websites fail to load on WiFi.
Should I turn off VPN if android mobile data not working on wifi? Yes. A VPN or proxy can break the route on WiFi and make traffic fail until it is disabled.
How do I know if the router is the problem? If Android works on mobile data or another WiFi network but fails on one router, the router firewall, filtering, or gateway is likely the cause.
Can my carrier block mobile data on WiFi-related traffic? Yes. Carrier or ISP filtering can affect specific domains, ports, or APN routes even when the phone is connected normally.
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