Telephones and prisons

permission requested to use the image -
The Phuket Prison is going to install security cameras to combat the problem of mobile phones being smuggled in.

Then I read that

"as many as 12 mobile phones a day were being thrown over the walls, some stuffed with dead rats".

"twenty of these phones had been confiscated".

Which means that there are still a lot in the prison?

photo from the Phuket Gazette
Then I read that AIS has set up a stall outside the prison to give away free Sim Cards.

"A sales hostess stationed at the booth said the prison was a good place to promote AIS services as there were always large crowds of people facing long waits to see inmates."

A shrewd business move and subsequent exposure...