One of the best ways to allow other devices to use your phone’s data plan to get on the internet (a process called tethering) is to have your phone become a little wifi hotspot. Then, any wifi device can get internet access via your phone. To do this with the HTC Aria, follow these steps:
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Rooting the HTC Aria on AT&T is made trivial by the program you can download at http://unrevoked.com/

So far the only good reason I have found to root your HTC Aria is so that you can enable wifi tethering, but that requires a few more steps which you can read about in my next post.

In addition to rooting your phone, the unrevoked application adds a custom recovery image to your phone (Clockworkmod recovery – http://www.clockworkmod.com/ )

This open source recovery system allows you to backup your phone to SD-card (nandroid backup), and load other ROM’s.