If you are looking for a UK sim while travelling, I do not recommend that you use Lycamobile. Try Giff Gaff or one of the others. I purchased one Bank holiday weekend, registered it and purchased a £10 bundle. Unfortunately I entered a 7 in the number instead of a 1 so of course I could not use the sim. Being a long weekend I could not contact Lycamobile until Tuesday. When I did speak to an advisor I was advised to send an email which I did and received an automated response saying that a Representative would contact me. The Advisor told me that it would take 24-48 hours. When my phone was still not active after 48 hours and I had received no contact, I contacted Lycamobile via their 322 number and was advised that a senior advisor would contact me. I have received an email telling me that Lycamobile are not liable for my error but as a goodwill gesture they will transfer the credit in 3-4 working days. As I am returning to Australia in just over a week this is not a great deal of help. My husband has had excellent service and no hassles using a Giff Gaff sim and top up. Based on the service and response I received from Lycamobile I would not recommend them at all.