Re: TalkTalk seem to be doing this already...
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I just switched from BT Infinity to TalkTalk fibre and saved myself around £30 a month.
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The top Infinity package is less than £30 per month, so unless Talk Talk are offering free broadband and charging £5 less line rental as well, I can't see how that's possible. I am at present quite happy to pay BT £26 a month for genuinely unlimited broadband that gives me 70Mbps download speeds about 90% of the time, very rarely drops as low as 50Mbps and has a steady 10Mbps upload speed at all times (with only one brief 10 minute outage in 3 years). Sure, I would switch to another provider if they were both cheaper *and* would provide at least the same level of service. My experience of cheaper services however has been that while they advertise "unlimited" use, they have a sneaky FUP that sees me throttled to dial-up speeds should I dare to download more than a few GB a month, and I only get close to the headline speeds between 3AM and 4AM twice a week.