Forget about messing around with apps. There’s a powerful voicemail handling system built into nearly every big carrier today — and that system almost always includes a system for recording a voice message and sending it directly without ringing the target phone. I will walk you through the process of doing this on Straight Talk (since that happens to be my carrier) but most carriers will have similar systems.
Step 3) Input the number of seconds that the iPhone should ring. Now type *11* and then enter the number of seconds that you want your device to ring before the call is sent to voicemail. If you want it to be 10 seconds, then you should now have the following on your phone app. *61*+123456789*11*10. Now you can place the call.

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To get the most out of your voice mail it’s important that you properly set up your personal mailbox. Press the voice mail button on your phone and enter your password (0 0 0 0 by default). Press 5 from the mailbox menu. Press 1 to assign your no answer greeting Press 2 to edit the greeting, begin recording when prompted. A typical greeting says “Hi, you’ve reached Mitch Scott. I am currently on the other line or away from my desk. Please leave your name number and a brief message and I will return your call as soon as possible.” press # when finished. Press 1 to set this as your active greeting Press 5 to edit mailbox greetings Press 7 to record your mailbox greeting and follow the prompts to record your mailbox greeting (You can repeat the greeting you used in step 3). Press # when finished. Press # from the main menu Press 7 for personal administration Press 2 to record your name “Mitch Scott” press # when finished Press # from the main menu Press 7 for personal administration Press 3 to enter your directory name Press 2 and follow the instructions to enter your name in the directory Press # from the main menu press 7 for personal administration Press 1 to change your password Press 2 and follow the instructions to change your password.