WhatsApp is a great application that is useful for instant messaging from iPhone-to-iPhone for FREE. It is akin to the Blackberry Messenger, and is a rival application to the much famed Ping, which picked up a huge following due to the $0 price tag when it first launched. (They have since launched Ping Lite which is still free).
However, WhatsApp seemingly does not support quite a number of countries, but there is a legitimate way around it. Their website quotes in their FAQ:

What countries do you support?
Most of them! We took …

Last weekend, I attended a wedding and had the opportunity to use 2 iPhones simultaneously to capture photos. @warrentan had just picked up his iPhone 3Gs the night before and it was still brand spankin’ new! Here’s a side-by-side comparison of how the photos turned out from both phones.
For the iPhone 3Gs, I did use the tap-to-focus on the subject feature. All photos are not touched up, and are saved at the highest quality after adding the watermark in Photoshop.
Initial observations are that the tap-to-focus on the iPhone 3Gs also …