After Vodafone changed their pricing structure my none expiring sim has now become a 30 day expiring sim so time to kick them into touch.......their coverage is abysmal as well. Looking around a found the giffgaff offer for data bundles only...same sim, different options. After a few problems getting my MiFi unit set up it works a treat. I found out it uses the o2 network but GiffGaff APN details which was the problem As a trial i bought a 500mb gigabag for just £5...any useage over 500mb within the 30 day period is charged at 2p per mb. Yesterday i used 12mb browsing and posting on FUN so it will easily last me a month. I only use the MiFi if i cant find a free hotspot, a BT hotspot (we have BT broadband) or i want to use online banking etc as the MiFi is secure and encrypted so even £5 a month is excessive for me.