Passive Voice is used when the focus is on the action. It is not important or not known; however, who or what is performing the action.
My mobile phone was stolen.
In the example above, the focus is on the fact that my phone was stolen. I do not know, however, who did it.
Sometimes a statement in passive is more polite than active voice, as the following example shows :
A mistake was made.
In this case, I focus on the fact that a mistake was made, but I do not blame anyone (e.g. You have made a mistake).