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Last updated: April 8, 2026

Quick Answer: Using a corded phone during a thunderstorm can be dangerous because lightning can travel through telephone lines and cause electrocution. However, using a cordless or mobile phone, especially when not plugged into a charger, is generally considered safe as they do not have a direct connection to the outside wiring system.

Key Facts

Lightning can travel through wired telephone lines, posing a significant electrocution risk.
Cordless phones and mobile phones are generally safe to use during thunderstorms if they are not charging.
The risk of lightning strikes affecting internal wiring systems is minimal with modern cordless and mobile devices.
Seeking shelter and avoiding electrical appliances and plumbing during a thunderstorm is the primary safety recommendation.
Staying away from windows and doors during a storm can also reduce the risk of secondary lightning effects.

Overview

The question of whether it's safe to use your phone during a thunderstorm is a common one, often fueled by cautionary tales and a general awareness of lightning's destructive power. While the immediate instinct might be to disconnect all electronics, the reality is a bit more nuanced, particularly when distinguishing between different types of phones and their connectivity.

Understanding the physics of lightning and how electricity travels is crucial to answering this question accurately. While wireless devices have significantly reduced the risks associated with traditional landlines, it's still beneficial to be informed about the potential dangers and best practices to ensure your safety during severe weather events.

How It Works

Wired Phones and Lightning Conduction: Traditional corded telephones are physically connected to the outside telephone network via copper wires. Lightning, being a massive electrical discharge, can induce significant electrical surges and currents that travel along these wires. If a lightning strike occurs near the telephone lines, or even strikes a pole or tree connected to the network, that electrical energy can travel directly into your home through the phone line. This surge can injure or even kill someone holding a corded phone. The electrical pathway is direct and the potential for a dangerous current is substantial.
Cordless Phones and Charging: Cordless phones, while having a base station plugged into a landline and a power outlet, also have a wireless handset. The primary risk associated with cordless phones during a thunderstorm arises from the base station being connected to both the phone line and the electrical grid. If lightning strikes the power lines or the telephone lines, the surge can travel to the base station and potentially to the handset, especially if it's being charged or is in very close proximity to the base. However, the risk is generally lower than with corded phones because the handset itself is wireless.
Mobile Phones and Wireless Signals: Mobile phones, which operate on cellular networks and do not have a physical connection to any external wiring in your home, are generally considered the safest to use during a thunderstorm. They do not act as a conduit for lightning to enter your home. The signals they use are radio waves, which are not a pathway for lightning. The only potential, albeit very low, risk would be if you were using your mobile phone while it was plugged into a wall charger, as this creates a connection to the electrical grid.
Induction and Proximity: Even with wireless devices, there's a theoretical risk associated with being near a lightning strike. While not directly conducting electricity, a very close lightning strike can induce electrical currents in nearby conductive materials, including electronics. However, the likelihood of this being a significant danger with a mobile or cordless phone is extremely low compared to the direct conduction risk posed by a corded phone or being near metal objects. The primary danger from lightning is direct strike or ground current.

Key Comparisons

Feature	Corded Phone	Cordless/Mobile Phone (Unplugged)
Connection to External Wiring	Directly connected via telephone lines	No direct connection to external phone lines; mobile phones are entirely wireless
Risk of Lightning Conduction	High	Low (mobile phones are safest)
Risk when Charging	N/A (always connected to line)	Moderate (if charging via mains power)
Best Practice During Thunderstorm	Avoid use entirely	Safe to use (mobile phones); use cordless with caution if base is near electrical sources

Why It Matters

Impact: Lightning strikes can carry millions of volts of electricity and temperatures hotter than the sun's surface, making any conductive pathway extremely dangerous. In the United States, lightning causes an average of 30 fatalities and dozens of injuries annually.
Impact: While indoor activities are generally safer than being outdoors during a thunderstorm, the risk is not entirely eliminated. Electrocution through household wiring connected to external lines remains a serious concern.
Impact: The Federal Communications Commission (FCC) and the National Weather Service strongly advise against using corded telephones during thunderstorms. This recommendation is based on documented cases of serious injury and death.

In conclusion, while it's wise to exercise caution during a thunderstorm, not all phone usage carries the same level of risk. For maximum safety, avoid using corded phones and charging any electronic device connected to a wall outlet. Mobile phones, when used wirelessly, offer a safe way to stay connected, allowing you to monitor weather updates or contact emergency services if needed.