There can a number of reasons for juno email not working such as the Juno configuration settings are incorrect on your iPhone or the credentials you are using for login are incorrect or insufficient space in your phone. This issue may also occur due to slow internet speed or you are using an outdated or incompatible version of the browser. Excessive cache and cookies are also responsible for the juno email not working on iphone issue, so to fix the problem, delete the cache and cookies. Make sure to stay connected to a stable e source of internet. Ensure that you are using the correct login credentials to get the issue fixed.