It sometimes happen that you forget the screen lock that you have put on your Q mobile NOIR and after numerous tries even, you cannot figure it out. After you try wrong screen unlock pattern 10 times (you can change the number of allowed attempts from Settings), the built in feature of Android will ask you of you Gmail username and password. Logging in through Gmail will resolve the issue and you will be able to use the mobile again. 
However there can arise some situation where you are unable to log in to your Gmail account as well. Some of the situations are as under:

1. There is no Wi-Fi available at your location
2. You had previously turned the Wi-Fi off on your mobile    Read More>>