Iphone 5 vodafone unlock on pay as you go?

I just wanted to ask will it cost me any money I get my new iphone 5 unlocked I know it's free if your on a contract with vodafone but I'm on pay as you go I heard its about. £20 top up money to get it unlocked by vodafone can any one back it up if its true thanks

Error message the sender address was rejected by the server?

Ever since I got my iphone 5 my yahoo email has been all messed up on both my phone and ipad. I deleted my acct. On my phone & ipad then reloaded it using the "other" option on the phone and inputting the incoming/outgoing server info. It worked for a few days and now today neither devices are allowing me to send emails. I can receive them… For now. When I try to send it puts my emails in the outbox and I get the error message "the sender address was rejected by the server". Please help. I'm afraid if I continue to have problems I will need to drop my yahoo email account.

What's the best app to download to amplify sound?

I'm hard of hearing but not so much that I have a hearing aid. I'll be going back to college soon and would like to know if there's a good cheap or free app for the iphone that I can download to help me hear my instructors. All I've found so far are hearing test apps.

My iphone is saying its disabled?

I have a iphone4s. Every time i try to download an app or download something from iTunes it is saying that my apple id is disabled. I can't receive or send any email. I tried to change my apple id and my password but that did not work.

Please can smb tell how Can I upgrade my iphone 3GS ios 4.0.1 to IOS 5?

I have an Iphone 3GS IOS 4.0.1 and I'm really pissed off as I can't open most of the apps as they crash all the time.
Neither can i update apps as they require ios 4.3 or higher.
I would like to upgrade to ios 5 and then unlock the phone again.
My phone is not factory unlocked so i guess i'll have to upgrade and then jailbreak and unlock again… But the issue is that nobody i've asked knows how to upgrade to ios 5 now that ios 6 is out.
I don't want to upgrade to ios 6 as some friends of mine who did said their phone is either dead after the upgrade or crashing and doesn't support it well.
Please can somebody tell me how to do this?
Thank you very much in advance!
I would really appreciate some help.