Is there a way to see if a device is capable of making telephone calls? Either to cell or landline? I know, in theory, someone with Skype installed could make calls through that, but I just want to check the main phone capabilities, and then hide a list of contact buttons should the device not be capable of making calls

I haven’t done this but you could try to create an intent to make a phone call and see if there’s a handler - maybe a default handler - for that