ISE FS GSM devices such as the A317 utilize AT&T’s 3G network. AT&T has announced that its 3G network will be available until February 2022 or such other national 3G network retirement date that AT&T provides to its customers. ISE FS GSM devices still in use when AT&T completes the retirement of its 3G network will no longer be able to communicate using AT&T. AT&T’s 3G infrastructure sunset plan may affect connectivity during the sunset period.