London Moving around London: Cittymapper is a very helpful APP to get around London. You'll be able to check all the buses, trains, expected waiting time and money it costs from your current location to your destination. You need to get a transport card (Oyster card) in order to get on the bus or train. It costs 5 pounds and It is refundable. Mobile phone and data: You can get a UK number for free. You just need to order your sim card at https://www.giffgaff.com. They send it to overseas and you'll get data and be able to call straight away. Free attractions: Most museums are free entry. You can spend a few hours in the British Museum, Tate Modern, Natural History Museum or the Science Museum at no cost. London Theater: If you want to get cheaper tickets for the best musicals try to go to the ticket offices near Leicester Square. You may find last minute tickets for a good deal!