Amazing, I have been called today for over using their unlimited service.
The transfer for last month a massive 56gb.
Just a warning to anyone thinking of joining them, this was the Access product.
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sorry to hear you have, hopefully this is more an isolated incident and not a glimpse into the future of O2.
 Google is your friend. Besides, unlike every other isp if you keep going over the limit they'll wave the rest of your contract and let you leave. That single reason puts it ahead of all the others.