Whether cell phones work during a power outage is important: short power outages may be inconvenient, but long ones may be part of a natural disaster or other emergency when communications is critical. Fortunately, a cell phone will work during a power outage, although users should remember there are many reasons why calls might not get through.
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Cellular Power/Danger Points
Cellular services depend upon antennas and base stations to connect calls from one tower to another and to other cellular and landline providers. Assuming your cell phone is fully charged, power outages can still call cause problems at cell towers, cell company switching equipment, other cell service and landline providers, and business and residential users.
Cell Tower Backup Power
Verizon reminds investors that the FCC imposes "specific mandates" on wireless carriers including "backup electric power at most cell sites." Therefore, cell towers typically have battery backup arrangements that support operations for two to four hours, depending upon call traffic. In 2008 the FCC wanted to order an eight-hour minimum, but the Bush administration asked for more study. In critical service areas, battery backup is enhanced by generators that automatically start when the batteries cannot provide enough power.
All Towers Except Yours
In a power outage, a cellular provider with 25 towers in your region may be proud that only one tower failed to stay in operation, but if that's your closest tower, you won't be happy, especially if you're in a suburban or rural area where towers are relatively far apart.
Your Provider's Switching Equipment
Expect your provider to have backup power for their switching equipment, which should continue to work for as long as they need it to, but there could be a lot of extra traffic. Some calls may experience delays, which should only be for urgent purposes.
Your Mother's Cell Tower
If your relatives or friends or boss use another cell service provider, their vulnerability is the same as yours, including whether their phone was fully charged when the outage started.
Your Company and Grandfather's Cordless
The company you work for may have backup power to stay in operation, but residence users usually don't. For example, grandfather finally got a cordless phone and still doesn't want a cell phone, because the copper wire landline he's had for 40 years will work fine during a power outage. Older style central offices have plenty of backup to power the equipment and lines themselves. However, the cordless sitting next to him as he tries to read the paper by candlelight will not work or even ring, so Grandpa cannot even know you're calling.
Grandma’s Old Phone
However, if Grandma still has an old hard-wired phone on the wall in the kitchen or next to the bed, they'll still be able to receive your call on these phones as if nothing has happened.