Vodafone UK ended its week by extending its SIM-only options for service with a unique spin for iPhone users. A new £25 ($39) monthly plan gives those with unlocked phones both 600 minutes as well as 1GB of data, unlimited messaging and free access to BT's Wi-Fi hotspots. The strategy lets iPhone users on "other networks" switch to Vodafone without necessarily taking a step backwards, Vodafone says.