O2 share plans - 2 phones, 1 contract

Anyone got a share plan from O2 ?  Its a package where you could potentially have 2 phones sharing the data on one plan/contract.
I'm wondering if it could work out cheaper than having 2 separate contracts with different providers. No price details on their site and their customer service were clueless also, directing me to go into one of their stores and talk to sales staff. I'd rather avoid that torture esp if its a waste of time, I just want an estimate of the monthly cost.
Anyone on here got one of these share plans?