Speedtest from xtremelabs.com is a great native app for iPhone which tests and measures your network bandwidth by benchmarking your upload and download connection speeds. There is a nifty history feature so you can compare different locations on the fly. If you travel often you can use Speedtest to compare Wi-Fi, 3G or Edge data network speeds in different cities. Speedtest is available now for free from the App Store.
Since I upgraded to iPhone 3G I was having a devil-of-a-time connecting to my wireless router. WPA/WPA2 was the encryption scheme and I was struggling trying to pinpoint why the iPhone 3G was unable to join the network while my original iPhone was still connected to my Belkin N1 router. I had plenty of client slots open for DHCP to add me onto and there were 2 other iPhones in the home having no connectivity issues at all. I was getting pretty frustrated until I resorted to going through my router configuation settings link by link to see what I could find. It turns out that MAC address filtering was enabled. MAC stands for Media Access Control and it has nothing to do with Macintosh computers. A MAC address is like a digital fingerprint for wireless devices. The solution: add your iPhone wi-fi address from Settings - General - About to the router’s MAC address filter and that will allow it to join the network.
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