I signed up 9 months ago for just £6 and got a boosted deal of 12GB per month instead of the standard 5GB.
The App works well but constantly logs out and doesn't remember login details.
With Vodafone and Three merging there is very good UK coverage.
I only switched because I found a company offering 20GB (instead of 15GB) for the same price, albeit with a credit check.
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