How can I reset an Iphone 6 with no passcode or itunes?

I'm an uber driver and i've been holding onto this iphone 6 someone left behind for over a year now. I'm deciding to sell it but i want to unlock and reset it. I have downloaded Itunes onto my computer but when I tried to connect it I get an error message 0xE8000015. The phone has a passcode so I can't get into it that way.

What are some solutions for unlocking this phone and resetting it?

Can I use a sim card from an iPhone 5s that is broken in a iPhone se so I keep all my info?

Can I use a sim card from an iPhone 5s that is broken in a iPhone se so I keep all my info?

I bought a iphone se from simple mobile it has to be on their network for 12 months can it still be unlocked from a third party website?

I bought a iphone se from simple mobile it has to be on their network for 12 months can it still be unlocked from a third party website?

Consigliereste l'acquisto di un iPad 2018 (quello economico, per intenderci), se si possiede un Surface Pro 3?

Sono possessore di Surface Pro 3 , ma ho notato che non è così immediato e portabile come un tablet. Lo utilizzo per scrivere documenti, per prendere appunti all'università e va una bomba. Ma per quanto riguarda le ricerche lampo, per l'utilizzo veloce, non è il massimo. Ho anche notato che la batteria sta un po' scemando ultimamente. Ho deciso, quindi di interfacciarmi con il mondo apple, dato che sono già possessore di un iPhone e mi trovo magnificamente. La mia domanda è quindi la seguente: Conviene davvero comprare un iPad (2018, quello a 350€)? Si discosta molto dal Surface per un uso puramente spostato verso lo studio su internet (ricerche e varie) / svago?

If I sync my iPhone to iTunes will I lose any information?

If I sync my iPhone to iTunes will I lose any information?

I can't use my mail on my iPhone It says: There's no connection to the server. What can I do?

I can't use my mail on my iPhone It says: There's no connection to the server. What can I do?

How to delete data from an iPhone?

I have an IPhone and can't delete data from this app. I went into settings and deleted it multiple times, I made sure to turn off and delete my backup and though it says "Never Used" when I download the app, it still has my data from before. I've even looked it up but it says go to Profiles under General and yet, that's not a setting on my phone. How do I fix this?

What volume should I listen to music with headphones in class and so no one hears ANYTHING from inside my headphones?

I use iPhone 7 but I don't think that matters.

How can I find my iPhone?

How can I find my iPhone?

Added (1). I lost the iPhone somewhere in my house. I don't know my apple I'd. Apple reset pages are only letting me verify by phone. I have find my iPhone on in it.

I did a factory reset on iphone without entering icloud password. Will there will be problem when the next person tries to activate it?

I factory reset my daughters iphone to send it back to Sprint. I do not remember entering an icloud password when I reset it. Are there going to be problems? The phone looks to be reset.