Does the iPhone sync with every computer it is connected to?

I connected my iPhone to a computer (not mine) to charge it and I didn't pay attention to what the computer displayed.So, did my iPhone sync with the computer? (Like photos, music, apps… Etc.)

And BTW I don't have access to that computer.

Which one to choose Iphone 3gs or ice cream sandwich device?

I'm going to buy a micromax funbook infinity tablet but I'm getting a deal of an I phone 3gs.
I'm confused that which one should I buy. I don't have enough money that I can afford both the devices. Please help me. Also tell on what grounds I should not buy one of them?

Will it be cheaper Iphone 4 and 4S?

Me and my sister want an iphone because we have sh*t phones atm but we don't want to spend so much money on an iphone so because they are bringing out new models. Will the Iphone (4 and 4s) go down in price? If so, how much? And when?

Can't use Personal Hotspot through USB?

It all started yesterday, while I'm browsing the internet using Personal Hotspot connected through USB, suddenly my connection went out. I checked my Iphone, I still have my 3G connection on my phone but the blue bar that saying "Personal Hotspot: 1 connection" saw gone. I didn't modify anything on my iphone neither on my macbook (i didn't update anything). When I tried opening itunes, it says "An unknown error occurred (-42408).

I can connect through Wi-Fi somehow, but most of the time my macbook can't detect my iphone.

And when I try connecting through bluetooth, my iphone says "connection unsuccessful: make sure "the macbook" is turned on and in range" even tough my macbook's bluetooth is already "on" and my iphone is just beside my macbook.
Is there anybody else who has the same problem as mine? Thanks guys.
Sorry for my grammar.

MAC OSX 10.6.8
ITUNES 10.6.3
IPHONE 4 Version 6.1.2

Share Wi-Fi 50 feet to a flat?

My brother is due to move into a flat directly over the road from my house(50 feet).
I have 20 mb broadband in my house and a modem and wireless router.
My brother would like a wireless network in his flat for his apple tv and iphone.
Is there a way for me to share my broadband with him not using cables as thats not possible.
I have direct line of sight window to window with no obsticles.

How do apple repairers find out what's wrong with iphones?

My iphone 3 only charges when powered off and plugged into my computer.computer and itunes dint recognise device.
Shopping centre has an iphone/ipod repair stall. He said its either the battery or something to do with hardware.
So i want to know how do they find out? Do they plug sonething in and run a check. I just don't want to get hit with a double charge like if he "thinks" its the battery so he replaces it but its not the priblem.