The Depths of Hell

After hours of hopelessly pondering around the phone, desperately awaiting for a buzz for her phone, Lilly began to feel tired and could feel her eyelids shutting into a state of sleep. Suddenly, a ring came from her phone. Lilly pounced from the couch and sprinted toward the phone- almost bumping into things during the process.
"2..8...1a..bb," the text read, glowing on the screen.
What could this mean?