Check the warranty status of your phone.
Go to a Nokia Care Point for face-to-face support
Enter *#0000# on your phone’s keypad. The display shows your phone’s model and product code.
On older phones, these numbers are printed on a white label in the battery compartment, underneath the battery.
No, you need an online connection in using Nokia Maps for Windows Phone 7. The map data is streamed on as needed basis and it is not cached.
Note that offline support is included in Nokia Maps for Windows Phone 8.