https://www.three.co.uk/Free_SIM_MBB/Order If you hardly use your phone, this could be perfect!
Either a Network Three, or an unlocked will be required for this Network Three SIM.
And a minumum of a 3G-enabled Phone will be required for it also. :-)
This Network Three SIM is effectively a 123 SIM that saves you £2 a month on data.
Calls and text 3p and 2p with data at 1p MB after you've used the first 200mb!.
And of course, Top up will be needed to be able to make use of either calls and/or text facilities.
A minimum top up of £2 is required to make use of credit for International calls and texts.
After you've used up the 200MB, it's only 1p/MB, or alternatively you can buy an add-on to get better value out of this.