Data usage on a Wi-Fi connection

I got my iPhone two days ago and I've been careful about using data. So far I've been using a wireless connection to use apps that need internet, and I've only used my 3G data once to check when a store opens/closes. I always exit out of background apps right after I use them. I got a text this morning saying I've used 75% of my data (I'm on a 100MB plan), but I've only used 3G data for a good 1 minute. What does this mean? Help! Thanks in advance.

I'm with Telus (Canada) if that makes any difference!

Some water came onto iphone, now speakers don't work?

If i play music or want to get text tone i can't hear anything unless i use the headphones then it works. But by it self it does not work although i can record a voice memo and then hear it back. BUT why can I not hear music or hear the text tone?

Wi-Fi keeps shutting off automatically on iPhone?

I recently purchased an iPhone 4S and ever since I connected it to my Wi-Fi home network it has been disconnecting off of the Wi-Fi and using my 3G. The Wi-Fi works great on my other devices, and I have to keep manually going to settings to connect it. Please tell me what to do to fix this issue and let it stay on the network until I manually disconnect it. 10 POINTS for the correct answer

How to do a factory reset on an iPhone 4s?

I have an iPhone 4s that has a passcode on it. I do not know the passcode because I found the phone. I'm wanting to know how to do a factory/hard reset on the phone. If you can help, please do!

My iphone won't sync properly?

Every time i try to sync my iPhone 3gs with iTunes it doesn't work. I upgraded to the newest version of iTunes and it will get to step 3/3 and the little sync icon appears on my phone when i do it but none of my songs or apps go to my phone. I have looked online and posted something on the apple website but haven't gotten any responses. Any help fixing this would be awsome

Sim card transfer from iPhone to Samsung galaxy s3?

I currently own an iPhone 4s with over 2 years left on contract. If I wanted to purchase to new Samsung galaxy s3, would I be able to just buy one new from the box and put my sim card from the iPhone into the new phone? Or is there something else I need to do. If this is possible is there any drawback to it? I'm currently with mts with 2+ years left on my current contract as I said.