With most free electronic versions of the NIV you have to be connected to the internet to view them.  During the month of January, You Version are providing the NIV to download so that you can read it whilst offline.

It’s available for iPhone/ iPad / Android / Symbian / Kindle / Windows Phone / 8 and a few other platforms so it’s likely you’ll be able to run it on your device. You can go about doing that by clicking here.