Londontopia relies pretty heavily on their smartphones when traveling in London. This can be both a good thing and a bad thing when you consider how ridiculous international data roaming charges are.
Despite this, they found a few useful apps that were indispensable on their recent trip to London that they just had to share with everyone. Many don’t rely on data roaming if you use them carefully.
Even with roaming turned off on your phones, some of these apps can be very useful. Where possible both the Android and Apple App Store links are provided.
Source & Connect: Londontopia