As we know, we have to “JailBreak” our iPhone/iPod Touch to change carrier name and time string. But with iTunes Backup Manager, we can do this without jailbreaking.
Please follow these steps:
1.Run iTunes, connect your iPhone/iPod Touch, when its name appears in iTunes, right click it and select “Back Up”.
2.Close iTunes, run iTunes Backup Manager, select your iPhone/iPod Touch name in left tree pane, find Library/Preferences/com.apple.springboard.plist in right list pane and double click it. 
3.Find first tag in the plist Editor window, enter follow contents:
<key>SBFakeCarrier</key>
<string>your carrier name</string>
<key>SBFakeTime</key>
<string>YES</string>
<key>SBFakeTimeString</key>
<string>your time string</string>
4.Select main menu->File->Restore, select Restore only modified file(s) and press OK, wait few minutes til the restore success. 
5.Your iPhone will restart automatically and the carrier name and time string changed: 
More iPod/iPhone related software please visit our home page about how to transfer music from ipod to computer.
[...] it works well! Our all posts about iTunes Backup Manager should also work with iPad. For example, change carrier name and time string to give your iPad an unique head text. Here are two screenshots taken by a friend from South [...]