There are 3 levels of “root” we can define:
Level 1: Shell Root (with ratc rooting the adb shell but no /system write access)
Level 2: Temporary Root (/system/bin/su installed but lost on reboot)
Level 3: Full Root (/system/bin/su installed and sticks)

Some devices have a NAND lock. SuperOneClick will only give a Shell root until you remove this lock.
The following phones can use http://unrevoked.com to remove this lock:

• Sprint EVO 4G (HTC Supersonic)
• Droid Incredible (HTC Incredible)
• HTC Desire GSM
• HTC Desire CDMA (HTC BravoC)
• HTC Aria
• Droid Eris (HTC DesireC)
• HTC Wildfire (HTC Buzz)

THe HTC Legend and My Touch 3G 32A also have a NAND lock and need more specific methods to unlock.

“The T-Mobile (HTC) G2 has something different which may or may not be a hardware flaw. I have yet to really research the device, but while it may root, it won’t be permanent since copying /su to /system/bin/su has problems. I believe this is a Level 2 root, but to be honest, I need to research more.”

All other devices has a Level 3 root via SuperOneClick

The program requires Microsoft .NET Framework 2.0+ or Mono v1.2.6+
Operations systems with native support:

• Windows Vista
• Windows 7
• Ubuntu Hardy (8.04 LTS)
• Ubuntu Jaunty (9.04)
• Ubuntu Karmic (9.10)
• Ubuntu Lucid (10.04 LTS)
• Ubuntu Maverick (10.10)
• Debian Lenny (5.0)
• Debian Squeeze (testing)
• Debian Sid (unstable)
• Debian Experimental

If you run Microsoft Windows XP, install .NET Framework v2.0 or above
If you run Mac or another Linux flavor, make sure you install Mono:
http://www.go-mono.com/mono-downloads/download.html

For more information about making it work in linux: see here

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