To get the nano sim to fit into the iphone5 shouldn't be that hard. Pop into a Three Store or Vodafone One which are the stores for two of the main carriers in here (Three and Vodafone respectvely) and they'll sell you the card. Also try Tim stores (Telecom Italia Mobile).Prices may vary,anyway a Tim card should be priced 10 euros,a Three card may cost you from 5 to 10 euros. A bigger reseller (larger stores) will normally be cheaper. Those will be prepaid cards,they're valid for one year and you can call text and surf the web with them. There are options you can activate in stores themselves that will last you for a month at prices going from 10 to 20 euros depending on bonuses. Normally you'll get one giga (1Gb) for 8-10 euros,or. ten giga (10Gb) for about 20 euros.