Using your smartphone in London may incur data charges, so check your data allowance with your phone provider. You can cut costs by downloading any apps before you travel, and by using London's many wifi hotspots when you're out and about.
Alternatively, download some of these free London maps and guides in advance.
1. Visit London app - official city guide and offline maps

Read More: 1. Visit London app - official city guide and offline maps
2. TfL apps

Download the TfL Oyster and contactless app on your smartphone to top up your pay-as-you-go credit, buy adult-rate travelcards and check your balance. Plan ahead and get around London with the TfL Go app, which helps you find the best routes and travel outside of peak times.
Read More: 2. TfL apps3. AccessAble app

Travel around the city with confidence or plan a trip to a new London area using the AccessAble app. You can ensure that your specific needs are met by using detailed access guides for attractions, venues and areas around the capital.
Read More: 3. AccessAble app4. Citymapper London app

The Citymapper London app simplifies public transport in London by providing up-to-the-minute information and multiple route options. Features include disruptions, offline maps, prices, taxi fares and even calorie burn counts!
Read More: 4. Citymapper London app5. Santander Cycles app

Explore London with Santander Cycles' free app - also on Android - showing you bike availability and routes to the nearest docking station. Receive a bike release code to your phone and hire a cycle without using the docking station terminal.
Read More: 5. Santander Cycles app6. Natural History Museum app

Use the Natural History Museum visitor app to navigate to hidden treasures and popular highlights, such as the famous Dinosaurs gallery, special exhibitions and the Cocoon experience. The app is updated regularly with details of events and exhibitions to help you make the most of your visit.
Read More: 6. Natural History Museum app7. London Architecture Guide app

8. Uber Boat by Thames Clippers app

You can buy tickets wherever you are for the Uber Boat by Thames Clippers using the Uber app or Thames Clippers Tickets app, meaning no queuing or printing before you travel. Activate your ticket as you board and show it to the crew. There's also the option to check live departure times.
Read More: 8. Uber Boat by Thames Clippers app9. Raise Tower Bridge app

Download this free Tower Bridge augmented reality app, and take your smartphone up to the Walkways to see the bridge being raised in a 360-degree panoramic video.
Read More: 9. Raise Tower Bridge app