Unlock my iphone but don't know the carrier?

I bought an iphone 5 from a friend that works at a hotel that he found. I want to switch to straighttalk and spent $63 on the bring your own device package but the sims aren t valid. I looked into unlocking my iphone but i don't know what carrier the guy who left it had. I know its canadian because i searched the phone number. How should i go about unlocking it?

Malware infecting my iPhone?

About a week ago, I came across a ransoware where I couldn't escape the webpage until it redirected me to my app. I didn't download anything from the store but I fear that my iPhone may have malware. My phone seems to be working ok until it started overheating without using much data or energy. Can anyone help me?

What can I do to change the contact I'm texting, back to iMessage?

I have an iPhone 5c. I have been using iMessage but I was texting someone and my iMessages wouldn't send because I wasn't using Wi-Fi at the time and my 4G was turned off. I simply pressed "send as text message" every time I was sending an iMessage. It automatically started changing to text messaging every time. It would go back to iMessage sometimes but I would keep pressing "send as text message" and now my phone won't go back to iMessage with that certain person. I have turned my phone off and even restarted it.

I dropped my iphone 5c and it went black but I can still hear noises coming from my phone?

I dropped my iphone 5c and the screen went black after a few minutes. My warranty is good for another week so i took it to team mobile to see how much it would cost to fix, they said it would COST $350 TO FIX IT.
I DON't HAVE THAT KIND OF MONEY TO SPEND ON MY PHONE. I still have apple care too. Should it cost that much money? And if not how much should it cost. What do i do? And if it does cost that much money how do i come up with the money in a week.

My Iphone 4s keeps breaking its batteries?

Hey so I got this iphone 4s a while back on ebay for a steal of a price, but it had a terrible battery. I replaced it and it worked perfectly. After about a month or two the iphone battery broke again. Now the iphone won't even turn on, it just gives me the please charge symbol. Why does this keep happening? How can I permanently fix it?

IPhone 6 screen not working?

IPhone 6 screen not working?

Added (1). touch screen was glitching last night so i turned it off and turned it back on and now it's totally not working and i tried to back up everything to my computer before i take it to the apple store but it can't back up without the passcode and touch id needs the passcode to get into it since i turned it off but i obviously can't put it in because the screen isn't responding to my touch!

How to hide my iPhone at summer camp?

How to hide my iPhone at summer camp? - 1

Added (1). I'm going to summer camp this year and have been going for 3 years but this year am looking to bring my iPhone because I hate the idea of not having my phone with me. Don't tell me not to bring it, not asking for that. Just some sneaky, hiding ideas to help me bring it places that it would never be caught and found by a counsellor. I could do an empty deodorant can but other ideas are appreciated too… Thanks!