Hello 71 year old man have been Type 1 insulin dependant for the last 29 years, have recently completed six month trial and accepted on to Libre 2 sensors with N H S financing cost of sensors. When on the trial had lots of sensors failing to work for 14 days or refusing to work at all, but up to now first 3 months all sensors have worked perfectly. My question is concerning using I Phone to read sensor I am currently using the FreeStyle Libre 2 Reader, I have an I phone 7 which is the minimum required to read the sensor. I have downloaded various tag reader from the app store but none seem to work. Do I have to pay a subscription for the tag reader to work on the Phone, don't want to be scammed !!!!!!!!. Thanks for any replies.