Unlocking iPhone 4GS while abroad

[Anonymous]

Hello!

I'm going to be in the USA for work for what looks like 3 months. I would like to unlock my UK iPhone so I can get an American Pay-Go sim. I went online and filled out the unlocking form, but I don't have my iPhone on all the time so I won't actually receive the text message notification I'm told I should check. I figured I would just periodically go off Airplane mode and see if a text comes through.

I then got an email from O2:

Kana Case ID: 405328363 (KMM758941598I15977L0KM)

Thank you for your iPhone unlatching request.

I'm sorry, we have not been able to unlatch your iPhone at this time.
The reason given is: Sorry, you have not passed our security checks with
the information that you provided. Kindly check that you have provided
the correct information.
Thank you

There isn't any link to how I can fix this, so I can't tell what security check I didn't pass.

Any ideas?

[MI5 · Accepted solution]

The only security checks are your Tariff details and amount/date of last bill, so it must be one of those you got wrong. Try form again with correct info. You don't need to have the text to unlock the phone, just connect to iTunes with an american SIM in phone and if processed, iTunes will unlock the handset.