I found a freeware game S-Tetris 2, being an old fan of the game I just got to have it. So off from download to installation, SIS file in and installation started. The application was not trusted so I paid attention to what was my E61 going to say about it.

"...untrusted and may be harmful to you phone" good enough. Additional information shared bit information about why the message was shown. So all about origin not verified etc.

Moving on, I got to have the game so. The next message raised my hair up: "Allow application to: Use network or make phone calls.", now I got concerned, why would this application need such functionalities!

I selected the additional details to check what it had. There was clear explanation of each possible option the user may have and at the end:  "Only allow the application to use the requested functions if you know the supplier and trustworthiness of the application.", I don't know Elements Interactive B. V. But decided to trust them and finalised the installation.

When starting the game I realised why the network connection was needed. Uploading the highscores naturally...

So, I guess I'm safe, all information was provided by the device and my device I trust. This is a way to get few capabilities (LocalServices, UserEnvironment, NetworkServices, ReadUserData, WriteUserData) for your application. However it may add few heart beats to users reading information on how to use the mobile devices securely (http://www.ficora.fi/mobiiliturva/english/index.html).