Can router affect a smartphone signal?

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In very rare cases, yes, a router can affect cell phone signal. This typically happens when the router and the cell phone are using very close frequencies.

WiFi routers use radio waves to transmit data, similar to cell phones. Most routers use the 2.4 GHz and 5 GHz bands. Cell phones, on the other hand, can use a variety of frequencies depending on the carrier and technology (3G, 4G, 4G+, 5G). LTE, a common 4G technology, uses frequencies between 700 MHz and 2700 MHz.

If a router is using the 2.4 GHz band and a cell phone is using a frequency in the same range, there is a possibility of interference. This can happen if the router is very close to the cell phone, or if the router is old or poorly shielded. The interference can manifest as slower data speeds, dropped calls, or weak signal strength on the phone.

Some newer routers also use the 5 GHz Wi-Fi frequency. While this frequency is less likely to interfere with cell phone signals, it can still happen in some cases. This is especially true if you're using a cell phone that uses a carrier aggregation feature that combines multiple cellular bands to increase data speeds.

Here are some things you can try to minimize interference:

• Move the router away from your cell phone.
• If your router has a 5 GHz band, try using that instead of the 2.4 GHz band. 5 GHz is less likely to interfere with cell phone signals. Anyway, it's a better way to replace the 2.4 GHz band router.
• Restart your phone and router. Sometimes a simple restart can resolve temporary glitches.

Other FAQs

• How to change WiFi password on your router?
• How to fix poor cell phone reception in house?
• 4G+ vs 5G, Is it the same as 5G?
• What are the differences between 4G and 4G+?

If you are still having problems with cell phone signal after trying these tips, you may want to contact your cell phone service provider.