I recently jailbroke my iPhone 3G running OS 3.1.2. Then I installed MyWi to check out the tethering capabilities for the iPhone. With this app you can tether using USB, bluetooth and wifi.
Here is the speed test results.
The latency is pretty high but the connection seems consistent. I used to run a Verizon V740 internet card and was getting higher speeds – close to 2x faster download. I’m also getting a full signal on AT&T 3G – surprisingly.
Anyways, my Verizon contract is up and I terminated the service. I hardly found use for it. With MyWi, $10 seems like a good deal. Hopefully, AT&T doesn’t pull a “switch” to somehow disable this app.