Originally Posted by sggolf
I'll be in London and suburbs for a few days next month and would like to get advice on whether its better to get some sort of international plan added to my AT&T/Treo 600 or get a prepaid SIM while in the UK
One thing that no-one has touched on, and will significantly impact your choice, is whether you're intending to use any of the data features of your phone.
At £5 per megabyte, you'll get murdered on Virgin, for example.