Surprisingly this is a very simple tweak which enable you read these magazines absolutely free. Follow the below few steps and you are in.
Step 1. In Firefox: enter “about:config” in the location bar
Step 2. Enter “useragent” in the filter and change the value for “general.useragent.extra.firefox” to “Mobile Safari 1.1.3″.
Step 3. Open zinio.com/iphone and here you can start reading your favorite magazines.
After reading, set it back to setting to “Firefox/220.127.116.11″ to get back to normal mode. By the way you could also read magazines like Playboy and Penthouse. Thanks caul for the tip via Labnol