how to clear/erase info from iphone 4?

[CBillups1]

currently have my iphone for sale and when i do sell it. how do i go about clearing everything from the phone?

keep in mind, the phone is jailbroken and unlocked.

 

[theDUB]

Do a full restore using the same iOS version you are running now, re jailbreak and unlock.

 

[CBillups1]

on itunes?

 

[jenzjen]

Search the web, lots of tutorials. You need to restore it to your old firmware (to clear the phone) then re-jailbreak.

 

[tshandy]

Is it necessary? Could someone perform deep data mining on an iPhone's flash memory the way, let's say, the FBI can do on a standard hard drive?

 

[CBillups1]

why wouldnt it be neccesary? ive got apps and sites im logged into. thats why. it has all my info.

i dont think you want to sell something with access to your info on it. might as well start giving out our SSN

 

[tshandy]

I wasn't implying that it wasn't necessary just curious about flash memory. I've always disposed of old hard drives with a drill or mallet because (as I've been led to believe) you can never completely wipe a hard drive. Is flash memory different? Can you actually wipe it perfectly clean?