We arrived in London on the morning of April 10, 2012 and left for the US on April 18, 2012. We visited this store 3 times to purchase prepaid minutes for our phone. The morning of 4⁄10 was the first visit and the salesman took time to explain our options, specially in relation to our travelling outside London and also to Paris. The two other times that we went, we got the same great customer service. This store was just around the corner from the Holiday Inn Mayfair where we stayed and the Sainsburys grocery where we shopped.