But while people buying an old one-day pink travelcard could use it on the buses, Tube and overland rail, many train companies refuse to accept the equivalent pay-as-you-go on Oyster.
Americans are expected to use credit card rewards to cover some of their costs during the summer travel season, according to a new survey by Capital One.
If you travel to Canada and want cellular service for more than emergency use, then plan on purchasing a local SIM card and perhaps using Telestial or another International virtual GSM network provider for inbound service.