With 3 you can add all ypu can eat data to any contract for £3 per month.
So if you are not fussed about voice minutes apparently you can get the £6.90 12 month contract that gives 200mins and 5000 texts then pay a further £3 per month for all you can eat data making it £9.90 per month... that's what I plan on doing.
I am on GiffGaff at the moment and don't like the increase to £12, all I use are texts and data.
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CURRENT DEVICES -
Google Nexus 4 (Stock)
B&N Nook HD+ (Carbon Rom)
Sony Ericsson P900, O2 XDA Mini S, T-Mobile MDA Vario 2, O2 XDA Orbit 2, LG Renoir, HTC Diamond, Blackberry 8800, HTC HD2, Sony Xperia Play, ZTE Blade, Nexus S, Nokia Lumia N800, Nokia Lumia 520,
Casio Cassiopeia E-125, Psion Series 5, HP IPaq 2400 & HP IPaq 3715, Nokia N770, ASUS EEE PC 701, Samsung NC10, Advent Vega, Nook Color, Nexus 7,