What does GPRS mean on my iPhone?

So sometimes when I'm out and about, instead of 4G i have the letters GPRS at the top of my iPhone. Its super fast, 9000x faster than 100G. By the way that was sarcasm. Its pretty slow, slower than an elderly tortoise going up a hill. What is this cuz of how slow it is it dosent seem like a proper internet connection to me… What does it mean?

Not receiving notifications or able to enter some apps on my iphone because network problems?

Recently, i haven't been able to go into some apps due to network issues. At moments, I'm able to. I can go to safari and it can go slow or normally.

I've taken the plug out of the router and placed it back in, turned off my Wi-Fi connection on the iphone.

I don't know what do do…

When i was connected to the Wi-Fi at my school, everything went normally--received notifications and was able to msg as normal.

Money missing in available balance?

I went to order a new iphone from o2, I then decided against it and cancelled the checkout (after giving my card details but before I was supposedly charged).

Now my available balance has dropped £10 bellow my account balance. Neither o2 or my bank are any use in finding out why so does anyone know why this has happened?

Added (1). I also have no pending transactions or payments, anything like that

How does iCloud work? Is it possible to control it from other devices?

Actually my main question doesn't really cover what my real question is so I will try to explain briefly. For a short period of time I have used my dads old iPhone and took some photos -some that I don't want him to see- today while we were on his mac looking at some old photos I have seen some of the photos that I took while using the device which were alright. But this got me thinking if he has access those on his mac he should also have access to my inappropriate ones. So my questions are, does he have all the photos that I took? Does the app automatically upload files to the cloud without asking the users consent? Do I have any way to delete these pictures from other devices such as his old phone? (I still have it and I already deleted everything) If I delete them from his mac will they still be on the cloud?

How to Change Headphone Sounds on iPhone?

I don't like the way my headphones sounded and it isn't loud enough for me and I'm deaf/hard of hearing. Headphones sounded better when both speakers are making the same sounds and not each one of them making different sounds. How can I make my headphones on both speakers sound loud and the same. My old headphones used to sound like that but unfortunately they Break and my new headphones sounded like crap. Anyways to make my new headphones like my old ones?

How to change iphone mac address?

I can't use apps as I have parental controls on my phone that prevent me from downloading apps.

Added (1). Apps as in mac address spoofer apps

My phone just died and I don't know why?

I was out this morning I had my phone in my hand. I was taking photos and I went to take some more and my phone wouldn't turn on. Its an iPhone 5. I know that its not a lot of info to go on but if you know anything please tell me.

My iPhone won't sync to my computer? - 1

I have it authorized and everything. It won't sync because I have two ringtones downloaded that won't allow it to sync. I've tried every way possible to delete them and to no avail they haven't worked. Any help?