None! Well almost...
If you subscribe to a iodéOS Premium plan, your email address along with your hashed password will be saved in our Wordpress database. These credentials will be used to connect your iodé phone with premium features and updates. In case you fill other optional informations, they will also be saved to our database and used for your monthly billings.
And that's it! No logs, or other connection information is saved or used by our servers. The only information checked when you connect your iodé phone to your account is if your subscription is active or not. Nothing more.