3 promo, cheapest is 3G Huawei Mifi £13 for 24 months, the 4G unit is £14 calls are 3p, texts 2p and excess data 1p per MB.
Offer is available on 12 month terms for a little more per month.
Mobile Broadband section of the website.
Might suit those who need 3 and ability to tether and make little calls & texts.
Just a heads up :)