How do Android phones back up address books and text messages?

ID is bound by default, and SMS can be saved in SIM card. If you want to change the ID, please register the ID to be changed before resetting the phone, and then add a HOTMAIL. Select the synchronization option in email and account in settings to synchronize contacts. After synchronization, reset the binding between the phone and this ID, and then enter hotmail to synchronize contacts. However, this method can't synchronize SMS, so if you back up SMS directly, it will be stored in the SIM card, but I don't know if the mobile phone and the previous mobile phone can be used. I haven't tried the synchronization assistant ~ because I just got it, I said I couldn't synchronize it locally.