Restoring iPhone completely?
Is there any way to restore an iPhone completely? I've purchased 1 refurbished and 1 new iPhone:
Refurbished iPhone with software unlock via Terminal (Mac) and the 6 files = constant interruption of signal, whether Germany's T-Mobile, Vodafone, O2, E-Plus. It says for a minute or so "T-Mobile," then it goes to 1 bar, then to "No Service." Then the bars go up again and, once again, down -- and so on and so forth. (unlocked it 1 week ago)
New iPhone = Unlock with anySIM. Everything works fine. Constant signal/reception. (unlocked it today)
So, I was thinking: What's wrong with my refurbished iPhone? Is there any way to restore it completely and use anySIM? Or is something wrong with the hardware of the refurbished iPhone that causes the constant interruption of the cell phone signal?