I have an old Android phone with a broken USB port so that it doesn't charge properly. There are multiple Google accounts so that different contacts are associated with different accounts. Possibly, some contacts have no association.
Can I hook up the phone as a USB mass storage device and off load all the contacts? Based on similar questions, I'm primarily concerned with "Device Contacts" which were never associated with an account.
Having contacts spread across multiple accounts is a secondary concern.
I synced the accounts and will look into uploading the account contacts to Google contacts. Still unsure how to deal with device contacts.