I just arrived in London today. I had bought a data plan. I tried using my phone at Heathrow to find the best route to my flat but there was no service. I got on the underground. I tried again (using an app called CityMapper). No service. No way to see what station to get off at. So I took a chance on Kensington. When I finally got above ground, I received a rapid series of text messages telling me I had gone over my data usage and was now over $100 extra and was locked out. The only way to get to my flat was to unblock the data. I have been charged $150 PLUS the $40 I paid for a data plan just for about 30 minutes on and off using an app to find my way to my flat. I will NEVER buy a data plan from Koodo again. Sim card tomorrow.