I imagine you definetly could use an arduino to electrically "press" the buttons, hardest part would probably be wiring that, and including a delay after every press to make sure it has time to respond
If you have (or can get) a handset that has a serial port, I think you'd find that easier to drive using the AT-based control protocol. I haven't used one, but I would be surprised if there wasn't a standard shield to do this sort of thing.
Yes a delay in the code, for example even tho you know what buttons to press to get a certain menu on your phone, you can't just pjnch them in as fast as u can or the phone may or not get there because most phones aren't the fastest devices, just take a not how long it takes for the screen to respond andd then wait that long after electrically pressing the buutons
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