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When you're using a mobile hotspot to connect your devices to the internet you might notice that your home router stops working properly. This is often due to IP address overlaps between devices. These conflicts happen because both devices are trying to manage network traffic. Sometimes they end up using duplicate DNS configurations, which causes IP address conflicts.

Start with reviewing your current IP assignments. Look at the IP address range your router is using. Most home routers default to 192.168.1.x. Now check the address pool your phone is assigning when it acts as a hotspot. Many mobile carriers use default 192.168.42.x, which causes a direct conflict. If both devices are using the identical subnet, your devices can't tell which gateway to use, leading to dropped connections.

Next, try disconnecting your mobile tether and see if your home router works normally. If it does, the problem is definitely related to the tether. Now reconnect the tether and check if some devices lose internet access. Sometimes your phone will assign itself a conflicting static IP, causing a duplicate address error. You can check this by looking at your device's network details on your computer or phone. Look for messages about IP conflicts.

This can result in double-layered network translation. This occurs when your carrier’s network assigns a separate gateway and your router is in router mode. This double layer can reduce throughput and disable port forwarding that rely on port mapping. To fix this, you can try flashing firmware to bypass routing. This turns your router into a LAN-only device and lets your phone handle all the routing. Alternatively, you can use the phone as your primary access point, though this may limit device capacity.

Review your hotspot’s advanced settings. Some phones allow you to change the hotspot's IP range. If you're using a 2.4 GHz or 5 GHz Wi-Fi band on your router, and your phone is using an overlapping channel, signal degradation happens. Try switching your router to an auto-channel setting. You can use a Wi-Fi signal mapper to see what other networks are nearby.

Power cycle both devices. Sometimes a temporary restart clears up stuck DHCP leases. After restarting, reestablish connections incrementally. If the problem returns once the phone resumes routing, you've confirmed the conflict. The best long term solution is to change your router’s subnet to a non-standard range. Try using 172.16.x.x, so it no longer overlaps with your phone's standard 192.168.42.x. This way, both networks can coexist without interfering with each other.