Limited internet on iPhone, ways to save?

I have an iPhone 4 on Verizon and since they got rid of their unlimited data plan a year ago I only have 2gb of internet. What are some ways I can save my internet so I don't go over? Is there any way I can get alerts when I'm about to go over? I already connect to Wi-Fi when possible.

How much it would cost to get my iPhones Wi-Fi fixed?

So I bought a used jailbroken iPhone from a friend but the wifis reception isn't working? I've literally tried everything like resetting my network settings, restoring the iPhone and deleting cydia. I think that there might be an internal problem with the Wi-Fi though so does anyone know how much it would cost to get it fixed by apple? Or if there's another place I could get the Wi-Fi fixed for pretty cheap?

Why does my iPhone 4 send my text message in two parts?

When i'm texting on my iPhone 4, it obviously shows me at the top that it's sending and it makes the little noise to show you it sent but sometimes it'll make the noise twice and all my friends tell me they'll get my texts and they'll get almost the whole text and it'll send another one with the last one or two words from the previous text. And i was thinking maybe it was over 1t60 characters or something and then i realized none of the texts i were sending were over 160 characters… Does anyone know what the problem is and what i can do to fix it, please? I don't like that.

Iphone volume is really quiet whilst talking on the phone?

I've just had a replacement iphone 4 which i've restored from back up but when talking on the phone i can hardly hear the other person it's fine if it's on speaker & music & ring tones etc are fine it's just when i'm on the phone is there a way to increase the volume?

Why does my singing sound so awful recorded?

I've had family, friends, and even teachers tell me I have a good voice. But whenever I record myself on my iPhone, camera, or laptop, I sound horrible.completely different from how I hear myself. Why does this happen? I want to make covers on YouTube, but I can't if every recording device makes me sound horrible.we're way too poor for professional recording equipment, so that suggestion won't help. I'm joining the chorus program at school, but I also can't afford singing lessons. /