The model of your phone (Nokia 3100, Motorola V400...),

If possible, the firmware version of your phone (your operating manual should tell you how to get this number),

Your network carrier (Orange, Vodafone...),

Your country of residence,

The specific version of PocketMetro 2.1: city, language and software version (the software version is printed at the bottom of the main screen and at the bottom of each error message),

Your email address, so we can get back at you as soon as possible,

As many information as possible to reproduce the problem: when it is happening (while starting PocketMetro 2.1, while using the main screen, the stations screen...), what the effects are (PocketMetro blocks, exits, a menu is wrong...) and so on.