What is the “callback” function used for in a Flexy205? Is it possible to use the Flexy205 as an auto-dialer to call a user about critical alarms?
Exactly which function are you referring to? I’m not aware of BASIC function called “callback”.
The Flexy can’t make outgoing calls. It has some legacy settings from older analog modems that you might be seeing. However, it can send SMS, either using a SIM card with an cellular plan or using an email to SMS relay.