I have upgraded my phone from an IPhone 6 and want to clear all my private information off the old phone.
Guru at O2 said to set phone to factory settings and then no-one can get bank details etc from the phone.
But in reading some replies to similar questions it says this does not work.
What do I need to do? I have no sim in the old phone at present.
could you post a link to those "similar questions" where the reply has been that this doesn't work please as I have always done this and never had a problem.