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The issue here is likely the version of Android installed on the phone. The wallet requires at least version 2.2, and I believe the Xperia X8 only supports up to version 2.1. You can still register for a wallet online @ http://o2.co.uk/money/wallet - and make use of the mobile website for the wallet to access it on your phone until you get a new one which can support a more recent version of Android. The mobile web version can be accessed from http://o2.co.uk on your phone's web browser.
