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I have been using Android for a few years now and I own a Note 2, amongst other devices, that I use to do rough SPL readings. I use the APP called Audiotool and I believe Noisemeter is also highly recommended for the same purpose. I also have a Dayton Audio iMM-6 Calibrated Measurement Microphone. This effectively by passes any limitations in the inbuilt mic' in the device. Audiotool does allow you to load the Dayton calibration file and the app' will use that when making readings. What it won't do (I believe) is get around limitations in the op-amp or DAC inside the device though the Audiotool Help file does have some sections devoted to that topic: https://sites.google.com/site/bofinit/audiotool#TOC-Rex-Beckett-s-Calibration-Method
Best bet would be to get a device with a DAC and op-amp that comes from a more high-fidelity family. I have an older Nexus S that has a Wolfson WM8994 DAC which is reported to be very good so I would perhaps have a bit more faith in readings from it. I would have thought that SPL readings would never need to be 20hz-20khz so hopefully limitations in band width will hopefully not affect the SPL reading too greatly.
Perhaps this will provide some insight into the hardware side of things: http://geeknizer.com/complete-guide-to-android-smartphone-audiophile/
 
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