Insert Sim Card Into Slot 1; Enable Volte (Optional); Make Sure That Trunk1 Sim Is Enabled For Outgoing Calls - Yeastar Technology TG Series Manual

Insert SIM card into slot 1

The red light next to the SIM slot will be solid once it has registered the SIM with the cellular carrier.
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Status > System Status > Trunk Status
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Verify signal and carrier
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Verify that the connection is 4G/LTE
o Hover your mouse over "Trunk1" to see details
o If the connection is not 4G/LTE, the call quality may not be as good and you may lose
support for the SIM if/when the carrier no longer supports 2G/3G
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If a PIN required for the SIM
o Click Trunk1
o Advanced settings > Pin code
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Note: "Trunk1" is the name of VOIP Trunk for the first SIM card slot.

Enable VoLTE (optional)

Voice calls on your mobile phone can use a traditional voice network or the cellular carrier's LTE
network (Voice over LTE). VoLTE will provide superior call quality as long as your LTE signal is strong.
Gateway > Mobile list > Mobile list
Click the edit pencil
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Advanced settings > Enable VoLTE

Make sure that Trunk1 SIM is enabled for outgoing calls

Gateway > Mobile list > Mobile list
for Trunk1