The offer from '3' looks very good. Various levels of speed/download capacity for modest prices in the UK. You can even get decent Pay as You Go prices by buying 28 days of access (from the date of access activation).
However don't expect to get anything like the same deals if you are roaming. The last time I looked it was £5 for a MB whereas in the UK you could get a GB for the same price.
So in the UK it is so good you can Surf without worry. Outside the UK I'd suggest emails only and never ever webmail!
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