How Do I Make Phone Calls Directly from My Mobile App? (Magic xpa 3.x)
It’s easy to enable phone calls from your mobile app. All it takes is one line of code.
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Define an Invoke OS Cmd operation, zoom to the Expression Editor and type in 'tel: and then the phone number, followed by a second quote mark ('), for example: 'tel:1-408-555-555'.
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From the Invoke operation’s properties, it is very important to remember to set the Execute On property to Client.