Data connection refused might mean it's locked, or the network your on doesn't have a GPRS roaming agreement with your carrier. I forget exactly how to do it, but if you search for "unlocked" or "unlocking" something along those lines, there is a procedure on how to tell if it's really unlocked or not.
Secondly, search for "IT Policy" for more info, but if he was on BES, they might have had a policy to limit the use of the phone. IT policies are not easy to get rid of without access to BES to clear it either. The short of it is, unless you can get someone with access to a policy.bin file or BES, it is next to impossible to clear the IT policy off the device.