Those of us who use Wifi for much of our data when at home / work might need a SIM with more data when going on holiday, perhaps for use in a second phone. The good news that you can use your allowances in the EU without issue can be coupled with a good short term deal – even if the SIM is then thrown away on your return. A example is the 6Gb SIM you can get in O2 shops. Its a true Pay as You Go deal, so there is no kind of contract or worry you might be hit with hidden charges (you don’t give them any details). They have their 6Gb data, 1000 minutes, 2000 texts deal at half-price – £10 for the £20 Data Bundle – in the first month. You will struggle to find a single month deal with so much data at this price.