All the OpenDyslexic and OpenDyslexic 3 packages are available free, here: https://gumroad.com/l/OpenDyslexic
Download OpenDyslexic2 from dafont.com (Click 'Download' on the right side of the screen.) Check the Dafont FAQ for more details on installing For your Phone and Tablet
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iOS
To use in apps:
Install the package located below, directly from your device: https://app.box.com/OpenDyslexiciOS
To override the font used everywhere:
Jailbreak your iOS device and install 'Open-Dyslexic.' Instructions on jailbreaking can be searched for using Google.
Android
To override the font used everywhere:
You can download the OpenDyslexic CM theme from here: https://gumroad.com/l/OpenDyslexic