Want to run Windows 3.1 on your iPhone? I don’t, but the fact you can is pretty neat, eh? But anyway, if you want to do this pretty neat hack, here’s how to.

1. Grab greenpois0n or limera1n to jailbreak your iPhone if you haven’t already.
2. Add the Cydia source: http://www.litchie.net/cydia to your list of sources, under the “Manage” tab within Cydia.
3. Locate and install DosPad Beta (1.92 is the latest).
4. Copy the Windows installation files over to your iPhone and place them in a folder named “winsetup” on /var/mobile/.
5. Create an additional folder named “w31” on /var/mobile/ (this is where Windows will be installed).
6. Open up DosPad and typ “mount –u c” (which will unmount your C drive).
7. Then type “mount c ~/w31” (which mounts your C drive to that empty folder we created earlier).
8. Do that again, this time for the A drive, by typing “mount a ~/winsetup” — this mounts all of those loose installation files in the winsetup folder to the A drive, as if you had the installation disks inserted into your virtual floppy drive.
9. Type “a:” to change the directory to the A drive.
10. Then type “setup” and your installation of Windows 3.1 should begin!
11. Run through the installation, which takes about 15 minutes. When it’s finished, you’ll be asked to reboot your machine.
12. Exit DosPad and clear it from your Multitask bar.
13. Relaunch it and type “mount –u c”, “mount c ~/w31”, “c:” and “cd WINDOWS”.
14. Type a simple and victorious “win” and hit enter. Welcome to Windows 3.1.