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Apparently there is a recent new trend among funeral homes and cemeteries. A lot of people are requesting that lost loved ones be buried with cell phones, blackberries, ipods, etc.. Some families seek comfort in being able to call a loved one for a time after they've been buried - obviously knowing no one will answer - but in hearing their voice mail message.
This reminds me of so called "safety coffins" that were a brief trend in the 1800s. Some people were so worried about being buried alive that they requested coffins with a mechanism that would permit them to signal their vitality from the grave, should it exist.
It seems a lot of 19th century designers missed the part that a buried coffin might quickly run out of air - rendering any signaling bell or flag pretty moot in short order. Nonetheless a lot of these coffins were put into use - though there is no recorded instance where one worked to save the living from the grave.
The recent trends with cell phones does not seem to have much to do with protecting folks from being buried alive. But if one happened to find themselves in such a situation - wouldn't that be a great time to have signal?!