Why is Apple and iTunes so complicated

I've had my own Iphone for about two years now and its still under my moms account and debit card who also has an iPod. How can I change the e-mail.Apple ID.debit card info. And iTunes and my e-mail login for JUST my device? Is this posible I've been trying to figure it out for like a year.

What's a good rubber case the for iPhone 5?

Does anyone know of a good iPhone 5 case that has rubber on the inside because cases that have plastic on the inside scratches the phone is there a type of case that is rubber on inside and out or the whole thing. Or can you tell me if the otter box scratches the iPhones body and screen.

Why can i Imessage from the same number, two different iphones?

I just recently got a new iphone because the other is messed up. But for some reason as i switched over to the new phone, i could still text people who had imessage on the old phone. But people who didn't, i couldnt text on my old phone. Why does this happen? Is it because its not really a "text" message?

IPhone 4 with rogers, needs to be unlocked to Telus?

I need the Code to get it unlocked, or a website that does it, thats not a crazy amount like 100$ I did it for my blackberry for 6.99$ but there's no website that i can find that does it for that cheap if its an iPhone

My iPhone says no SIM inserted?

I dropped my iphone 4s on the ground, it seemed fine but then when i looked at it, on the screen it said no SIM inserted even though my SIM card is in it, what do i do? Thanks

Added (1). I have also tried everything, i, turned it on and off, i took the SIM card out and back in, and i reset the settings about 5 times