I bought Spice fire one mi-fx2 with firefox os v1.4. I tried to log in to my Gmail account using the built in email app on phone. I was not connected to wifi and I was unable to log in. Then I got connected to wifi and tried. I could successfully log in. But to check mails I again need to connect through wifi. I want the email app to work with cellular data and not a wifi connection. I could log in into my account using the browser.