The problem with swapping out SIMs is that people who have your phone number can't contact you. AT&T Roaming typically costs about $500-$800/month with their i

The problem with swapping out SIMs is that people who have your phone number can't contact you. AT&T Roaming typically costs about $500-$800/month with their international plan for $120/ 800 MB roaming, $150/Gigabyte. It's a pretty common plan for US road warriors who are probably racking up $20,000-$25,000 in Hotel/flight charges already.