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Calls that go to directly to voicemail do so because the network can't connect to the phone or thinks it's busy, for whatever reason.
You can adjust the time that the phone rings before a call forwards to voicemail either by using GSM service codes (a.k.a. Hash Codes) or through an app, such as "Advanced Call Settings."
Hey there! The short code to delay the forwarding to voicemail is **61*18056377243**seconds# (Choose a 5, 10, 15, up to a 30-second delay. For example, dialing **61*18056377243**10#would be for a 10-second delay.)
But! If you are having this issue, as mentioned above, there may be some issue with your connection. You might want to reach out to care for troubleshooting or a possible trouble ticket with engineering.
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