Avoid using a corded telephone for the period of a lightning storm.You can chat away on a cell phone or a cordless phone at lightning storm because there is no direct path between you and the lightning.

According to the National Weather Service If you are using cordless phone bit, lightning can struck the line at the time you picked it up from its base, and it possibly will harm you.

Likewise, if you were using the phone close to the base while lightning zoomed through your lines and into your phone’s base, the current may arc through the air to your phone.