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No there is no voice guidance available for Asha phones.
The more map data you'll store, the more space it will fill. You can always use Nokia Suite to delete the map data which is not needed. Delete the one which you'll never need like the far away cities/states.
------- Die hard Nokian, willing to help other Nokia Users. Current Handsets - Lumia 900, Nokia 311, Nokia C3-00, Nokia C1-01, Nokia 6500-s.