Ella Birchenough, 16, was left red-faced when she had to be rescued from a storm drain on Eaves Road in Dover.
The teenager was talking to friends when she accidentally dropped her BlackBerry into the drain on Wednesday.
She then tried to climb in to collect it but struggled to get out again.
Kent Fire and Rescue Service attended the scene after receiving a phone call from Birchenough's mother Joanne, 36.
The fire service managed to rescue the girl and "make the scene safe".
The 16-year-old escaped without any injuries.