For the written how-to, visit http://www.phonebuff.com/2012/05/check-system-information-android/
In this video, I show you how to check your Android phone’s system information in two methods: through the settings and a third party application available on Google Play called Android System Info.
If you don’t want to download the app, you can always check things such as your Android version, available phone storage and RAM, battery status, kernel version, phone number, imei, etc. through Android’s built in settings.
Otherwise, for more detailed information, you can use the Android System Info app available for free to see exactly what build or ROM you have on your phone, what your processor frequency is set to (and how often it is at that maximum frequency, the camera’s maximum resolution, actual model number, and loads of more useful information. I do a quick walk through in this video on how to use the app.
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