Finnish privacy goes down the toilet

In some parts of Finland, if you want to use the roadside toilets, you have to send a text message from your cell phone to unlock the door. If you don't have a cell phone, or if you've never figured out text messaging on it, you'd better use the bushes.

This is supposed to be an anti-vandalism measure; people's phone numbers are saved. But it seems like a very ineffective measure. How often do road crews check the toilets for vandalism? If they find any, will the police investigate every person who accessed the toilet since the last check?

When you have to identify yourself to use the toilet, privacy has really sunk into the sewer.