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

Create a backup. Restore your iphone completely and then backup from your pc.

If its jailbroken I would never do that. The easy thing to do is just restore back to factory, and you are back to new again.

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