Hi Jenrai, the "above" achieve more gb by getting the most out of existing sims...as in one in each phone and one in mifi box. We also wonder about "several months" as we abroad for 4 months this winter. We have 15Gb via ee mifi (fair usage) but little on our phones. So have often wondered about local sims but all want long contracts with complex cancellation.....no easy payg data sim like the "nos" Portuguese one mentioned above these days. So we make do with 15Gb and free wifi....could do with more data for tv...Maja