Try *99# as the number to dial. You will also need to set the sony to have the correct access point setup in it's modem settings. This could be wap.o2.co.uk or internet, you can find it out by calling o2.
A general guide on setting up can be found here. Just give o2 a quick call from your T610 (or walk into a shop), and they'll be able to confirm the extra dial string command for you. The number to dial will be *99#.
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