Cell Phones Found in Bowels of Prisoners

The title is pretty self-explanatory. Full article here.

Quick Summary:

• Four prisoners in El Salvador hid cell phones, chargers, and spare chips in their lower intestine.
• The prisoners, members of the Mara Salvatrucha gang, used the cell phones to coordinate crimes outside of prison.
• The cell phones were found via X-rays after six weeks of investigation.

My $0.02: I wonder how the prisoners got the cell phones into the prison in the first place. Also, how did they know when the cell phones were ringing? Put them on vibrate?