There are a variety of ways for one to remove all contacts completely from an iPhone. One of the easiest ways is to download the 'Spring Clean' app. The app will bring up the full contact list and one can select all and delete. Many other processes do not completely clear the contacts.
Go to the contact and hit edit, then scroll down to the bottom and hit delete contact.
It shouldn't because all your doing is turning it on and off
Yes there are many Apps out there ex: Find My iPhone and also if you have iCloud account setup you can remotely erase the data from lost/stolen iPhones
Yes, well there are a couple of options, but i think. You should just erase the whole phone.
factory reset it or restore it
No. Replacing the battery will not wipe the phone. Make sure the phone is off before you disconnect the battery though!
the same way with all of the other iphones
Dry erase markers - it can erase off of anything, like Boards, Hands, etc... Wet Erase markers - it will be a little harder for people to take off of anything.
All you have todo is attach the iPhone to your computer insure iTunes is open and then select restore to factory settings options, which will reset the handset and erase ALL previous data.
Actually, It doesnt. 'Cause its the purpose of backing up the data. After the update, Your iphone will restore then it will put back your old data.
Contact Customer Service
you cant get dry erase marker of paper
erase it :)