There a $21.40 charge on my CC statement for MZLA Thunderbird email. I had no idea who or what Thunderbird was until looking online. Found the website and saw Thunderbird is a "free" email app. My Verizon rep added it to my new iPhone 16 when it wouldn't send emails via my normal email provider (breezeline.net). I was not told the app was being installed, or that there is a fee for use it. He handed me back my phone and I saw a new gmail account had been added. What is the charge for? And why was I charged?