Warning From CNET: iPhone "Restore" does not delete personal data! So before reselling or giving away your old iPhone 5C, you should erase all your personal or private data on iPhone 5C, and make the iPhone 5C as a new one.

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> Erase All Data on Your iPhone:
Contacts, SMS Text Message, Call History, Calendar, Email, Note, Reminder, iTunes DB, App (and generated data), System setting, Apple ID, Photo, Video, Voice memo, Keyboard Cache, Safari Bookmark, Passbook, and more

> Erase Traces of Deleted Files:
Contacts, Messgaes & iMessage, Call Logs & Facetime, Calendar & Reminders, Notes, Voice Memos, Safari Bookmark, Photos

 

iPhone Data Eraser app can help you wipe everything from iDevices, including contacts, messages, photos, videos, apps, account info, passwords and other personal data stored on iDevices. See more at: http://www.iphone-data-recovery.com.
Other tips:
How to Delete Songs from iPhone
How to Delete iPhone Data Before Selling
How to Retrieve Deleted Text Messages from iPhone
How to Restore iPhone Contacts

 

How to Erase iPhone Data Before Selling? If you want to delete your contacts, sms, pictures, videos and other data on iPhone permanently,you need to use a third-part iOS Data Erasr tool.
How to Erase All Photos from iPhone before selling
How to Delete Messages on iPhone permanently
As we all know,the simple “Delete” is not enough, and “Erase All Content and Settings” doesn’t really delete data, because some iPhone data recovery can get them back.However,we must to use a professional iPhone Data Eraser tool.Here,I recommend every one a powerful and useful iPhone data eraser software,which allows you delete everything from iPhone 6/5s/5/4s/4 and iPhone 5c permanently.
Read more from the following tutorials:
How to Permanently Erase Already Deleted Files on iPhone

 

You need to use iPhone Data Eraser program to delete the private data from your iPhone permanently. You can use it to scan your iPhone and find all the data you want to wipe out. Learn how to delete everything on iPhone.