Best way to erase all your data if your returning your iPhone 4?

UCF-ENG

macrumors regular
Original poster
Jun 7, 2010
126
0
Sadly, I am returning my iPhone 4. Do you guys know the best way to erase all your data but still keep your back-up?

If you restore a phone does it overwrite your back-up?

What about just putting the password in wrong 10 times? Is that a good way to remove sensitive data?
 

tjwaggoner

macrumors regular
May 8, 2010
104
0
Sadly, I am returning my iPhone 4. Do you guys know the best way to erase all your data but still keep your back-up?

If you restore a phone does it overwrite your back-up?

What about just putting the password in wrong 10 times? Is that a good way to remove sensitive data?
Restore it through itunes. Why you keeping the back up if you dont mind me asking?
 

McGiord

macrumors 601
Oct 5, 2003
4,530
286
Dark Castle
in your iPhone go to settings:
General -> Reset -> Erase All Content and Settings

All inside your iPhone will be gone, no need to hassle with iTunes.
 

UCF-ENG

macrumors regular
Original poster
Jun 7, 2010
126
0
Restore it through itunes. Why you keeping the back up if you dont mind me asking?
I really love the phone, and I like the way my Apps are layed out. I'm only returning it because the proximity sensor is driving me crazy and my 30 days are almost up. I'm just going to wait till Apple releases their software patch and see what kind of luck people have. At that point, if they fix the problem I'll probrably repurchase and restore from back-up.

So if I do a restore then it will leave the backup alone as long as I don't re-sync, is that correct?
 

tjwaggoner

macrumors regular
May 8, 2010
104
0
in your iPhone go to settings:
General -> Reset -> Erase All Content and Settings

All inside your iPhone will be gone, no need to hassle with iTunes.
On the 3gs and iphone 4 the erase all content and settings doesnt remove the data from the phone (overwriting it with junk) but only removes the encryption key used to access it. I dont know if that is a more secure way than the original phone and 3g (actually overwrites all the data with gibberish)or if itunes restore even does it differently. Just thought I would toss it out there, in case you or the op didnt know.
http://support.apple.com/kb/HT2110
 

tjwaggoner

macrumors regular
May 8, 2010
104
0
I really love the phone, and I like the way my Apps are layed out. I'm only returning it because the proximity sensor is driving me crazy and my 30 days are almost up. I'm just going to wait till Apple releases their software patch and see what kind of luck people have. At that point, if they fix the problem I'll probrably repurchase and restore from back-up.

So if I do a restore then it will leave the backup alone as long as I don't re-sync, is that correct?
Yes your backups will be there.
 

UCF-ENG

macrumors regular
Original poster
Jun 7, 2010
126
0
On the 3gs and iphone 4 the erase all content and settings doesnt remove the data from the phone (overwriting it with junk) but only removes the encryption key used to access it. I dont know if that is a more secure way than the original phone and 3g (actually overwrites all the data with gibberish)or if itunes restore even does it differently. Just thought I would toss it out there, in case you or the op didnt know.
http://support.apple.com/kb/HT2110
That's pretty interesting. So what do you do if you want to actually overwrite?

Do you have to go in and manually erase caches, erase pictures, and enter false account data...
 

bushbaby

macrumors 6502a
Aug 12, 2007
534
36
SoCal
I really love the phone, and I like the way my Apps are layed out. I'm only returning it because the proximity sensor is driving me crazy and my 30 days are almost up. I'm just going to wait till Apple releases their software patch and see what kind of luck people have. At that point, if they fix the problem I'll probrably repurchase and restore from back-up.

So if I do a restore then it will leave the backup alone as long as I don't re-sync, is that correct?
That's what I did. Even though I then did an erase from the settings menu, the store will do their own erase in front of you (at least mine did).
 

tjwaggoner

macrumors regular
May 8, 2010
104
0
What does the hardware encryption removal does? Is it better than the overwrite?
Like i said, Im not sure of the actual difference in the case of security. I just know that the 3gs and 4 are different. I have done both of my old 3g phones with the erase all content and it took a long time, just left them plugged in over night. One worked and the other errored out and had to restore it on itunes. Just wanted the op to know that the difference is there. Also Im not sure if doing it through itunes is any different, I know it takes considerably less time to restore a 3g through itunes as it does using the erase content and settings menu command. A LOT less time.
 

mlts22

macrumors 6502a
Oct 28, 2008
538
32
What I prefer is doing the erase all option, then a DFU restore after that. This way, unless someone goes in with a dedicated flash analyzing tool pin by pin, my data is history on that device.
 

CJayC

macrumors 6502
Jun 2, 2010
368
0
You can't try 10 wrong guesses immediately. You got five guesses, then you have to wait 1, then 5, 15 minutes, then 1 hour, then another hour, then another hour, and that's when you must restore.