I just tried to buy one but having filled in my Iban number a message said that my bank does not support their method of payment so then asked for sort code and account and got another message saying please enter a valid account , tried to phone and was told busy and got cut off so I don't know what to do now.Other than the actual toll charges you are debited a modest monthly account management fee only for the months you are using the tag. From the Mango/Fulli website:
“The monthly processing fees are only debited if you use the badge €1.70 per month used in France, €2.40 per month used in the Spain-Portugal zone and €2.40 per month used in Italy.”
That are still running the cracking OFFER with free sign-up, delivery, etc., but the changeover to Fulli in the new year might see an end to that.