What do you recommend for iphone cases?

I just recently got my first smartphone, an iphone, and I was wondering what people recommend for cases? There are a lot of options when it comes down to material and I wasn't sure if some of them protect the phone better than others or if it comes down to personal preference. So what do you think? What do you use, and do you like it?

What's the cheapest way to unlock an iPhone to work with a different carrier?

I bought a used iPhone 3GS on ebay for really cheap because it has a cracked screen but functional. It was listed as Unlocked but when I went to put my t-mobile sim card in today it turns out its locked with at&t. I have looked online for unlock services and they usually run $40-$50 dollars which is more than I paid for the phone lol. So my question is are there any cheaper services out there that will do it? What if I jail break it? The phone has iOS 6.1.6 btw.

Added (1). So could somebody refer me to the website they unlocked their iphone then? Maybe via email? All google brings up is these bs youtube videos that claim they do free unlocks when they really don't.

Blocked? I can leave a message on their iphone BUT?

It rings once, I hear their voice mail but it lets me leave a max, 4 minute long message each time - which i don't leave 4 minute long messages btw.

If I text, it delivers it immediately each time.

have I been blocked by an iphone user?

Iphone won't charge and won't turn off?

Basically my iphone won't charge properly, I have to keep unplugging it then plugging it back in around 20 times for it to charge, also when I turn it off it instantly reboots itself. At first I thought it could be because of water damage as I had it in my pocket when it was raining, but I've checked both LCI's in the earphone jack and charging port thing and neither are red. I don't think it's because my charger is broke either as its about a week old. Also had problems with sound constantly going off with both speakers and earphones and the lock button seems to not work occasionally. What could I do?

One speaker isn't working on my iPhone 5s, how to fix?

So I'm not sure how it happened it when because I usually have my headphones on when listening to music but I've noticed that the left speaker holes don't let out any music but the right ones do (on the phone not earbuds). Still though it's very loud so I don't see why I would have to get it fixed since its time consuming and to get it done well would cost a lot of money. Is their anything I could do at home with some supplies or what not. I have a silver iPhone 5s 16gb.