@Kevin_Z thank you for your reply but I do not find the answer to my question on the tether page, this is why I posted my question here, because I did not find the answer on the page you sent and on...

Hi, I'm checking the Tether app https://apps.apple.com/us/app/tp-link-tether/id599496594 And I saw that there are In App purchases (monthly, yearly or Total security) Where can I learn more about...