Avoid. I was very wary as they've obviously paid Google to get to the top of an aggregated search result for 3 UK Top up. Followed the process right up to pay and number one red flag was PayPal asking to verify the account payment, number two red flag was that in the on screen fine print you can read that you are actually authorising Ding to make regular deductions from your account. No way. I shut down everything and cleared cache and history. Reading these unfavourable comments about this disreputable company I'm glad I did not complete any financial transaction. Avoid.