I can't see in any place a tutorial that teaches how to use dash wallet for android. It's very interesting to know: - how to backup wallet; - what do user needs to do if he boughts a new cellphone? - a good explanation on address book. Mainly when user buy their first dash. Initially dash wallet generates only one address. After user receive dash in your wallet, another three address are generated. Why? Is there a difference among them? - For other transactions, can the user is able to use the same dash address?