How to download ios7 for iphone 4s?

I'm using iphone 4s but whenever i check for software update it notifies that my software is up to date i.e., ios6.1.3 but i want to download ios7 so can anybody help me to describe that from where i can download ios7 for iphone 4s and how?

Why does my iPhone not make any noises?

My iPhone does not play sounds through the speaker when I get the call. I also can't hear people when speaking to them in a call and it does not play music through the headset. How can I fix this?

How to crack iphone to sim free?

The iphone is not working. The message i got:
The SIM card inserted in this iPhone does not appear to be supported.
This iPhone is not currently setup to work with carrier you're attempting to use. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked.

How should I crack this to simfree?

Import videos into iTunes (iPhone)?

Importing videos into iTunes which is also my iPhone shouldn't be a problem. But when I change to another computer and I have authorize it as my second computer to sync with iTunes, I can't import videos into the iTunes anymore, but syncing PDF file is no problem at all. What is the problems anyone knows?

I DOPNT KNOW HOW TO FIX MY IPHONE?

Okay about 20 minbutes ago i was eating curried sausages for tea and i was on skype with my friend and was showing her something on my phone and dropped it in the curries sausge so i run and got rice and licked the bottom where it fell in and my sound now only works when plugged in on the charger and i honestgl don't know what to do! Can someone please help! :"

IPhone and bluetooth hands free, automatic selection?

I have a bluetooth stereo head unit in my car which can be used as a hands free however when I receive a call I have to select the output on the iPhone to get it to come through the speakers thus ruining the point of a hands free. Is there a way I can get the iPhone to automatically select the hands free when it is available? Otherwise I don't get what they are trying to achieve.

Added (1). And how would a photography app (lama app) help?

Do I need to change my iPhone?

I'm moving to the California very soon, from Sweden (big change, so excited! Whoop whoop!)

I use the Swedish network called '3' … When I move to California, which I believe uses 'AT&T' will I need to buy a brand new iPhone or can I just swap the Swedish SIM card chip for an American one?

Thanks in advance and I hope you're having a fantastic summer!