Can you use a Verizon iPhone 5s on AT&T without unlocking it?

Or does it have to be unlocked i just wanna know i'm gonna buy this iPhone 5s from my friend but its Verizon and i wanna use my AT&T sim for it do i just put the sum card in the phone? Or get it unlocked its for AT&T go phone but i'm currently using a iPhone 4

Can iphone 6 be tracked if reset and sim card removed?

Okay so I have a quick question so if someone made a call to the police using an iPhone 6 without a Sim card can the police track it and know the iPhones owner and number? Or only track it? Now let's say if this incident happened like one month ago and the police are now investigating can they now track it if the phone has been reset it and now have a active SIM card?

My laptop froze and has a mark, what do I do?

Okay so I try to make it word document created it obviously went to save my computer like a bunch of blacks great tangles starts popping up in my computer completely froze I can't turn it on or off y okay so I try to make it work document and ice created it obviously went to save it in my computer like a bunch of blacks great tangles surds popping up in my computer completely froze I can't turn it on or off! Also a long time ago a violent Mark appeared on the right side of my screen P also long time ago a violent Mark appeared on the right side of my computer screen! Both say I should get a new laptop but I don't know that's the first thing I should go with because I don't want to buy a new laptop! FYI I used my iPhone microphone so it may be a little sketchy! SRY

Why do my photos lose saturation when I save them from my email onto my iPhone?

This is a very weird situation it seems. I do photography as a side job, and for fun. I export all of my photos from photoshop in RGB color in 300. This is what's odd: I emailed the photos to my client and myself, and I went into the email and saved them to my phone. They looked very un-saturated. I uploaded the same photos that I sent in the email to my Facebook page, and saved those to my phone as well (SAME PICTURES) and side by side the emailed ones were less saturated. So I went on my laptop and saved the emailed pictures to my laptop and they look FINE? Why do my pictures only lose saturation when I'm saving them to my phone?

Instagram won't let me delete my account?

I really want to delete my Instagram account because I don't need it anymore, because I'm making a new one. I tried deleting my account on the IPhone app and there isn't an option that will let you delete it. I tried going on the computer to do it but when I try to log in it says "an error occurred." How do I fix this?