Iphone/Itunes music transfering

Is there a way to get music onto my iPhone from another iTunes account?
Also, is there a way to put the music from my iPhone onto an iTunes account?
I have new music on my iTunes account but can't seem to find a way to put it on my phone.

Audi TT 225 Aftermarket Stereo Installation?

I have a 2001 Audi TT 225bhp with the standard manufacturers stereo system. I'm looking to buy a aftermarket stereo from www.caraudiosecurity.com. Preferably one with aux cable included so i can attach my iPhone.

I'm just wondering if it is a simple swap such as removing the power leads, arial cable and connecting them to the new one. Or will there be some wiring needed?

Voice recorder - iPhone

On the voice recorder app, i want to be able to put a recording on repeat, i don't know how or what can i get to put recordings on repeat.

Iphone 3gs says 'no service'?

I just got another iPhone 3gs its exactly the same as the one I have previously. I'm on contract and with virgin however when I put my sim in the new phone it says no service, when I try my sim in my old phone it works perfectly. I've tried resetting the network setting but that didn't work. Why doesn't it work? Do I need to inform my contract that I've changed phone or do I need to do something else please help!

Added (1). The new phone is unlocked and there's good connection where I'm and I tried other sims from different networks and it still said 'no service'

Added (2). The new phone is unlocked and there's good connection where I'm and I tried other sims from different networks and it still said 'no service'

Should i sell my iphone 4 and buy sony xperia p?

I'm a iphone user so very conscious about touchscreen i really don't know about the touch of sony xperia p so tell me if its a good idea to sell my iphone and buy sony or if this is a foolishness