Is 20GB of Internet data enough?

I just brought a new iPhone and the only package available on EE was one with 20GB of Internet.
I will only have this for each month, I'm just worried about going over it.
If I'm connected to Wi-Fi does it charge? Or is it only when I'm roaming with my 4G on?
I don't tend to download videos or music as I have apps like YouTube and spotify. I do however keep my 4G on whilst at school until I get home, which is about 6 hours a day.
Am I going to have to start turning my data off or should I be ok?

How much does Safari cost on the iPhone?

So my mom said that I could get a phone but if Safari costs anything she is not paying for it so I just want to know if it's free or not, and if it's not how much will it cost per month?

Best app for FAA written test review?

I will be taking my written test for my PPL soon and I'm looking at apps for iPhone that will help me study. The two that stand out the most are Sporty's and the Dauntless Software apps. I'm leaning towards Sporty's because it is $9.99 vs. The dauntless is $49.99 however, I'm willing to invest the extra money if it is worth it. I was wondering if anyone has had experience with these and what that was?

IPhone text messages don't work if I delete a conversation?

Whenever I swipe to the left and delete a conversation it like breaks my text messages. After I delete the conversation I go to click on another conversation and it freezes oulining where I clicked it for about 6 seconds the it opens it and freezes again for about 5 or 6 seconds to where I can't click on anything. Also I can't receive messages from anyone whenever I do this, the only solution I've found is to reset my phone but if I delete a conversation again it does it all over again. Anyone know what to do?

Where is a good place to sell my iphone?

I just upgraded to an iphone 6. Now I need to get rid of my iphone 5. It's in great condition. I've had an otterbox on it since I bought it. There aren't any scratches or anything on the phone. It works great. I was told that I can sell it on Craigslist. That's a little scary. On the lesser scarier side, how would I know if they aren't giving me counterfeit money?

Where can i sell my phone and get the most money?
How much can I sell my phone for?
Can a cashiers check be made out to "cash", instead of my name? Certainly don't want to give a stranger my name!

Am I only one who hates the iPhone?

I got an iPhone 5s and the camera is horrible. The only way to take a picture is if you in a well lit environment. The color of your skin doesn't get picked up by the camera, instead it makes you looks darker than you are. It shows deep in your skin and I really hate that it doesn't show your original skin color. It's also worse for taking pictures at night. This is one of the iPhone problems but the iphone 6 camera is much better

How to reset a lost iPhone 5c?

I found a 5c on the ground with a lock. It doesn't seem hopeful of it getting back to the original owner so how can I get into it?