I have worked at one place where we were given phones. You picked up the phone each morning inside the shop and returned it that night. Each foreman was given a phone.
The plan was with with Cingular. You talked to everyone on the network for free and personal calls were not allowed(no way of monitoring unless studying the bill). It was pretty sloppy as most guys took them home and took advantage of it. People were continuously leaving it at home, losing, or damaging the phone.