Talk:United States/@comment-26269458-20180508200101/@comment-26674008-20180508225758

All of the networks operate in a unified way across all the states without roaming. So you can always use the same network (AT&T or T-Mobile) in other states. This isn't that you are ensured coverage. For example, AT&T has the poor coverage in some rural parts of Nebraska, Nevada, and Arizona (including Grand Canyon areas) and T-Mobile doesn't cover any part of Alaska at all even cities. Check the PREPAID coverage map for the network you choose. Plans are the same price, but taxes vary by state.

However you are perfectly fine taking your New York City sim card and using it in Miami, Seattle, Houston, and so on with exact same plan. Always use the Area Codes when calling.