Still receiving txts from the person before me's iPhone i bought

I recently bought an iPhone 4 from somebody off Craigslist and have been receiving their texts. The phone is off but can sometimes still text so I have been texting time to time on it but I guess whoever had that number still can text from it but why am I receiving their texts still? Its so annoying! Like is there anyway to stop it? I'm getting it flashed to cricket this weekend probably so maybe they can give me a new number? I just wanna know if anyone else has experienced this?

IPhone5S and iPhone6 Release Dates?

I just read and article that there's a iphone 5s being announced at WWDC in June and the iphone6 is being announced in September… I don't wanna waste my money on iphone5s if the iphone6 will be better someone help me please

Can i use straight talk tmobile sim card on my at&t iphone 4?

I bought my friends Iphone4 and I bought the sim card online through straight. I read up on the card and was dumbly mistaken and thought the card was tmolbile compatible but worked with other phone carriers and I had no idea they stopped working on at&t networks. Can I turn my at&t iphone into a tmobile iphone? Or can I magically make the sim card an at&t work sim card? Logic?

ITunes isn't allowing me to add music to my iPhone?

I plugged in my iPhone and it's up to it's current software and so is my iTunes, I don't have a folder playlist so when I went you go create one the playlist button it doesn't allow me to click it? I tried dragging and copying music over but it doesn't add. I have no music or videos on it, how do can I add music to my iPhone, thank you.

Itunes, Wi-fi Sync not working?

I recently purchased an iphone 5 and i want to set up the Wi-Fi sync, i did this on my iphone 4 and it worked fine but on itunes i cheked the box where it says iphone Wi-Fi sync and when i exited i checked my phone and it still isn't working any ideas?

How to update apps without using the App Store?

I downloaded some apps off of the Internet and transferred it to my IPhone 4S using a program I have on my computer called ifunbox. Anyways, when I tried to update apps using the App Store it said You have not owned the major version of the software. But it didn't say that before and I don't want to delete my free apps of course. But I was wondering if there was an app, program, or a Cydia source that would let me update my free apps. And whoever answers this question really good I'll give your answer five stars and choose it as best answer.