How to Download & Install Ultrasn0w on iPhone Manually?

Hello Janet, yes, you will be able to download and install Ultarsn0w 1.2.3 into your iPhone 4 manually through your desktop using a tool called iPhone Explorer as well as the Deb file of Ultrasn0w 1.2.3. You can download iPhone Explorer from here. And you can download Ultrasn0w 1.2.3 DEB file + MobileSubstrate package from this MegaUpload link. Once you have downloaded all the required tools and materials, you can follow the tutorial posted below to install Ultrasn0w 1.2.3 manually into your iPhone 4.

To install Ultrasn0w 1.2.3 manually, just simply launch the downloaded iPhone Explorer and connect your iPhone 4 to your PC (or Mac) through USB cable and place the downloaded Ultrasn0w 1.2.3 DEB file and the MobileSubstrate DEB file in the following location:

Location: /var/root/Media/Cydia/AutoInstall 

Copy-paste or simply drag the DEB file to AutoInstall directory. If Cydia or AutoInstall directory is not present, you can create them manually. That’s it. You have successfully installed Ultrasn0w 1.2.3 into your jailbroken iPhone 4. After rebooting you will be able to use your iPhone over other mobile phone carrier. Cheers!