Is 3GB good enough for the iPhone 4?

I'm worried that i will go over my data, and i have 3GB data plan… All i do is go on Facebook (app version) Snapchat, and Instagram… Do you think ill go over? This is my first smart phone. And how long should the data last with tose three apps?

IPhone 4S too hot & battery depletion?

I have had my iPhone 4S for just under a year and are having serious issues with it which weren't so bad earlier in the year. I realised since I've had the phone that the battery wasn't long-lasting but it has gotten much worse.

Over the past 3 days I have gotten the Temperature lock-out mode come into action and prevent me from using my phone for some time (this happens on idle or under minimal stress.)

Also, my battery lasts under 4 hours from a 100% charge.

What's wrong with my phone and what are my options?

Added (1). As I'm currently not at school due to the Christmas break, no music has been played on my phone for some time as I'm usually with my friends, at my computer or in my car. I never use my mobile for navigation purposes. I've actually used my phone lesser than usual, so I'm stuck!

Is it worth it to buy an Iphone 5?

So I still own an Iphone 3gs sadly and I think I'm still eligible for an upgrade but I don't know whether to buy a iphone 5 or buy an Ipone 4s but I don't want to buy an Iphone 5 if there's not much of a difference.

How to change the volume on your iPhone?

How do I change how loud the voice is when I'm talking to someone on my iPhone? It's really quiet when I'm talking to someone and when I press the + button it doesn't do anything!

How is GB and MB used on AT&T?

So today i got the iphone and i have 3GB in data, but i'm not sure how it works… Is it everyone minute is 1 MB, Is it one tape on something Is 1KB? I don't understand! Someone Please Help! Its my first smart phone

Mic on iPhone 4 not working?

I have the iPhone 4 running the latest iOS.
I can't talk, because the other person can't hear me. I can record voice memos, it comes out blank. But I can record my voice using the video recorder. It's a used iPhone, but the last time the mic didn't work was over a month ago.

YouTube is painfully slow on iPhone 4S, what can I do?

I watch YouTube videos on the YouTube app often on my brand new iPhone 4S. Once I upgraded from a 3GS to my 4s, I thought YouTube and Internet would become faster. Internet speed is the same, but YouTube is much much much slower! Videos take forever to begin, and buffer at least 5 times throughout the video, and each buffer takes up to a minute or two. It's getting very annoying, what can I do?

New songs I put on my iTunes won't sync to my iPhone?

I have everything I need to have music synced onto my iPhone, but it's not working. I have tried unplugging and replugging the cord, but it still doesn't work. I also tried updating iTunes, but it still doesn't work. Usually iTunes would tell me what music I'm syncing onto my iPhone, but now all it does is sync my iPhone and show me this.http://puu.sh/1IOyg
Sorry, I'm trying to be as clear as I can.