How Do I Backup and Restore Contacts When Flashing New Custom ROMs?
If you are going to be flashing new custom ROMs or want to be free from worrying about your contacts, simply use a GMail account for all your contacts.
When you sign into GMail, your contacts are automatically backed and and also restored from GMail contacts list.
Even if you don’t use GMail, I highly suggest you make a dummy account just for your contacts.
I own around 20 Android smartphones and whenever I get a new phone, I just sign into my GMail and instantly my contacts are instantly restored including phone numbers, e-mails, addresses, etc…etc…
Makes your life much easier when you use GMail for contacts.