On Sunday AT&T introduced new data plans for those in the U.S. traveling abroad. And if you plan to travel overseas, you absolutely must activate a new plan, or you will be charged at the rate of $19.95 per MB. The new plans offered start at $24.99/month for 50MB of data, up from the previous allowance of 20MB. The plans top out at $199.99/month for 800MB. Obviously, even with a plan you'll want to be very careful about your data usage. You can read more in a helpful article on TidBITS.