Hang on, I've heard this problem. We need to pour water into the duct until the phone floats up and ... wait, phones sink in water. Mercury. We need a vat of mercury to pour down the vent. That will definitely make this situation better and not worse.

"Typical Morning Routine", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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Hang on, I've heard this problem. We need to pour water into the duct until the phone floats up and ... wait, phones sink in water. Mercury. We need a vat of mercury to pour down the vent. That will definitely make this situation better and not worse.