Browser/device testing IOS vs. Android?

Browser/device testing IOS vs. Android?

I'm using Browser Stack to test a phone specific site built with jquery mobile. The site renders nicely on the iPhone 4, 4S and 5, but renders poorly on most Android devices. It renders very small on Android devices.  Not sure if this is due to Browser Stack, jquery mobile or something else. Any suggestions on how to develop mobile sites that render well both IOS and Android devices? Thanks.