When you go for SIM-only Big Data deals, you often have to spend big to get them. However, some offers from retailer Mobiles.co.uk help to combat this problem. Mobiles.co.uk can currently get you 60GB of data for just €11 a month on the Vodafone network. While that alone makes this deal really good, it actually gets better. Mobiles.co.uk also offers cashback on this rate. You can choose to receive €90 in cash back, reducing your bills to just €11 per month, but having to claim that cash back in five installments over 18 months. You can also reduce your cash back to €30. Although it's much less, you don't have to do anything to get it. You will simply receive full value within 38 days of receiving your phone.