I worked for their counterpart T-Mobile. There were different levels of access so normal staff couldn't access 'VIP' customer accounts.
I also had to investigate a colleague who was 'playing the system' to get cheap phones to sell on Ebay. The bosses were a little upset when they asked me to do it and my first response was send the request and authority on email. I certainly wasn't going to do it based on a word of mouth request which could be later denied.