Almost all smartphones (even in normal phones) there’s a feature that you can find the Usage of phone.Some phones give only the Call time and some others have the Cellular Data Network counts too.And also many of those phones don’t give an option to reset Usage statics, but some phones give an option, but instead of that it displays the Reset Date on there.Apple iPhone also displays that Reset Date if you reset your Usage Statics.But There are Two ways of Complete Resetting those Statics without the date.
  1. Restoring your iPhone
  2. Changing iPhone System files
If you are a iPhone user you may know the risk of restoring an unofficially purchased iPhone.But if you are user of officially purchased iPhone ,this option is for you.I don’t prefer the second method because it may kill the freshness of your phone. :D
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And the second method, you will think that it is a so dangerous and hard work.No its not.It will take just few minutes to Erase your Last Reset Date.So here we go
Warning #1: This guide was tested on iPhone 4 on iOS 4.3.5 , but still I don’t take responsibility of any damage caused to your iPhone. If you don’t know what you are doing, I recommend that you may use the first method.
Warning #2: This trick may just hide the last Reset Date from the viewers, and the last Reset Date is stored somewhere in your iPhone.So If you undo these steps,It won’t show back as Never.It will show the Date that you have last Reset.
Requirements 
  • a jailbroken iPhone
  • iPhone 30pin data cable
  • an iPhone file manager
Be Ready
First of all,you have to install a file manager on your iPhone.(I have used ifile on this guide).You can purchase ifile from cydia or you can install the cracked version through your computer.
If you want to install ifile from your computer , follow the steps below
  • Download ifile.deb file to your computer
  • Instructions for installing an application to iPhone was posted  in last article. [Read it Here]
Lets Go
  1. Launch ifile from your iPhone
  2. Now you’ll see the screen as in this image,If not click on the Home button from toolbar below.
  3. Now Follow the path given below
  4. Stash > Applications > Preferences.app > 
  5. From this folder you can find many folders named by the localization name.(ex-Dutch.Iproj , El,Iproj…)
  6. So choose your language on the iPhone and go there(If you are an English user, Go to English.Iproj)
  7. You can find a file named “Usage Statistics.strings” from the folder you are
  8. Now tap on it and open using Text Viewer
  9. tap on search icon and search as “last reset”,and you’ll see a text as – “LAST”  = “Last Reset :  %@” ; in the top of your iPhone screen
  10. Now tap on edit button that can be found on top.
  11. now change  (“LAST”  = “Last Reset :  %@” ; ) as “LAST”  = “Last Reset :  Never” ;
  12. Now tap on the Save button
  13. Exit from ifile and End the iPhone settings process (If you have opened it already)using multitasking bar
  14. Now go to settings and Reset your Usage Statics , you’ll see the trick :D
Rolling Back
If you want to undo what we have done,Follow the above steps to number 10.And change
  •  (“LAST”  = “Last Reset :  Never” ; ) as “LAST”  = “Last Reset :  %@” ;
But If you do this,iPhone will display the Reset Date again as the date you have Reset it last.
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