Seriously: What the Blue Hell?

Police around the country (like in my state) are cracking down on prisoners with cell phones.

Some questions:

1. How did they get the cell phones?
2. How are they charging the cell phones?
3. Where is the bill going to?
4. Why don't the prisons just block the signal (with exceptions for where the staff congregate)?
5. How could guards not notice prisoners talking on the phones or texting?