iNetwork Test is a small tool that can test your iPhone network speed. You can test how your EDGE or WiFi network speed compares to others across the country.
You can visit the iNetwork Test website from your iPhone to test how fast is your network. This tool works directly through iPhone, so you get pretty accurate results. Apparently, I went to that site from my PC and tested my connection speed. It showed my speed, and said that this is not an iPhone.