If you use Google's two-step verification feature, you will stumble upon an authentication error with SIM Manager, when attempting to synchronize your SIM with the online phonebook.
Two-step authentication is something that can easily slip out of your mind, so you may think that the problem is with your password, or with the software. After repeated attempts to synchronize your phonebook, you just give up (and maybe blame it on SIM Manager)
To fix this, you have to create an application-specific password in your Google account settings, and use that password with SIM Manager.
Log onto your Gmail account and click account settings
Edit your two-step verification settings
Click Manage application-specific passwords
Generate a password for SIM Manager
Use this password with SIM Manager
That's it. Have fun synchronizing your contacts!
p.s. the password in the screenshot has been changed, don't try to use it ;-)
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