How do I erase an iPhone 4 without internet or wifi?

[iMore Question]

how do i erase an iphone 4 without internet or wifi

I have an iPhone 4 I want to sell back but I need to erase all personal data. the number was transfeered to a new phone and it won't connect to wifi.

 

[Bigeric23]

Re: how do i erase an iphone 4 without internet or wifi

If I understand what you're asking:

https://support.apple.com/en-us/HT201274