You can read your purchased books on iPhone, iPod touch, iPad mini and iPad and all Android devices.
Make sure that you have downloaded the urduspace reader for the above mentioned devices.
This reader is Compatible with iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch (3rd generation), iPod touch (4th generation), iPod touch (5th generation) iPad mini and iPad. Requires iOS 6.0 or later. This app is optimized for iPhone 5.
This reader is Compatible with all Android devices. Requires Android 2.3.3 or later.