How can I erase all of the data on my iPhone 4 so I can sell it?

[iMore Question]

trying to erase data on my i phone 4 so I can sell it

I cant seem to erase the data without a internet connection which I don't have know on my old phone

 

[Bigeric23]

Re: trying to erase data on my i phone 4 so I can sell it

This should help:

https://support.apple.com/en-us/HT201351