In some cases, you’re able to disable all call forwarding.
Not all Android phones have this option.
verify if you have call forwarding.

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Open thePhoneapp, select theMenuicon, then chooseSettings.
Scroll through the configs and selectCall-forwardingif it’s an option.
You may have to openAdvancedorMore Settingsto find this.

Disable all call-forwarding functions.
Your phone should stop forwarding calls to your voicemail provider.
To do this, simply disable notifications for voicemailsyou’ll still be alerted about new calls.
OpenSettingsand tapApps>Phone>Notifications.
Tap the toggle next toVoicemailsto disable voicemail alerts.
Mobile carriers offer paid options, butGoogle Voicedoes it for free.
When you get a voicemail, Google transcribes it and then emails it to you.