Iphone doing things without permission?

I left my iphone 5 with ios7 on for the night as usual (screen locked) and when i woke up it had sent about 10 snapchats of a blank screen, and a text was sent to someone saying confirm your mobile number by replying (osn4193oandk) (i don't remember the exact numbers) my default search engine also randomly changed to yahoo while i was using it the next day and the night all that happened, twice a random alarm with a weird tone came from my phone and i didn't know how to turn it off (seemed like it came from stopwatcch) i'm just wondering what has happened, is my phone hacked? I know that i didn't do these things and no one came in my room and did this. Any info would be much appreciated

What's happening here? Urgent

My itunes/app store account is on my mom's iPhone, not my iPod. I have credits and stuff for games on that! I think I used the wrong email (it's my dad's fault. I knew it wasn't the right thing to do!) How do i get it onto my iPod?

Why is Iphone 5c so expensive in Pakistan?

I just saw the price of Iphone 5c on the apples website and i found that the price of Iphone 5c is about 99$ and 199$ but the price of Iphone 5c in Pakistan is about 650$. Why so?

In search of iphone bluetooth solultion?

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Fake iphone charges cause fires?

So I bought x7 iphone chargers the other day for £5 of eBay, I knew they were fake and everything but I got them because they were super cheap and colourful(each one is a different colour) I got told today by my friend that they can cause fires so I searched on Google if they can and it's all about the plug piece(bit that goes in the wall) the chargers I have bought are just cables and I would plug that cable into my real plug piece but I wanted to know if the cable can catch alight or if it's just the plug piece. Should I use these cables, but with my real apple plug piece?

Which phone to buy? Nokia lumia 1020 or iphone5?

Which phone should i buy? Iphone 5 or lumia 1020?
how is the battery? Which have long battery?
camera doesn't matter a lot to me.
in which of these phone whatsapp works fast?
and also mail system? Ty
also tell me some draws backs of iphone and lumia 1020 and also adwante of iphone 5