Well it will work on a GSM/GPRS/2G network. As you noticed, certainly in the US, those are getting rarer by the minute. AT&T shut theirs down on 01.01.2017 [1],

Well it will work on a GSM/GPRS/2G network. As you noticed, certainly in the US, those are getting rarer by the minute. AT&T shut theirs down on 01.01.2017 [1], and other providers also have plans to discontinue service in the near future. So on these networks, this module will simply not work or you are always in roaming. [1]: https://www.business.att.com/content/other/2G-Sunset-FAQ_2016.pdf https://www.business.att.com/content/other/2G-Sunset-FAQ_201...