AT&T has just announced the launch of a new service called eSIM by AT&T. It's aimed at people visiting the US, Canada, and/or Mexico, and the choice of countries makes sense when you consider the fact that the FIFA World Cup is taking place from June 11 to July 19 in exactly those three countries. AT&T is aiming this at people who will be arriving in North America for the World Cup matches.As you can see below, eSIM by AT&T comes in four 'sizes'. A one-day pass is $3.99 and only available for the US. A seven-day pass is $15.99 for just the US, or $24.99 for all three countries. A...