No. Replacing the battery will not wipe the phone. Make sure the phone is off before you disconnect the battery though!
To erase everything from your iPhone before selling it, follow these steps: Back up your data – Use iCloud or MobiKin Assistant for iOS to save your photos, contacts, messages, and apps. Sign out of iCloud and Apple ID – Go to Settings > [your name] > Sign Out. This disables Activation Lock. Turn off Find My iPhone – In Settings > [your name] > Find My > Find My iPhone, switch it off. Erase all content and settings – Go to Settings > General > Transfer or Reset iPhone > Erase All Content and Settings. Confirm your choice. Remove SIM card – Take out your SIM card before handing the device over. After this, your iPhone will reset to factory settings, ready for a new owner.
if you have all your media on your itunes and other files backed up in itunes (backs up on sync by default) then you shouldn't lose anything
To reset an iPhone model A1387 (iPhone 4S), go to "Settings," then tap "General." Scroll down and select "Reset," then choose "Erase All Content and Settings." Confirm your choice, and the device will begin the reset process. Make sure to back up any important data before proceeding, as this will erase everything on the phone.
you go to your history and erase everything
the same way with all of the other iphones
restore it on itunes
http://www.webtree.ca/windowsxp/repair_xp.htm
You cannot remove everything off your profile.
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.
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
No.