Not all phone carrier companies offer voicemail services but if they offer, they give the users many options. If you are using more than one SIM in your Android device, you may select the number of the voicemail service, provided by the Voicemail service provider. But, if you are using just one SIM in your mobile device, you have no choice to select the carrier.
If you feel any problem in selecting the voicemail service carrier, feel free to see the instructions.
1: Tap the icon of the ‘Phone Dialer’ on the bottom left corner of the Home screen of your Android 5.1 Lollipop device to open up the ‘Phone Dialer’ screen.2: At the ‘Phone Dialer’ screen, tap the settings button, placed at the top right corner of the screen. It will open up a popup menu.3: Tap the ‘Settings’ in the popup menu to open the ‘Settings’ screen.4: At the ‘Settings’ screen, tap the ‘Calls’.5: At the ‘Calls settings’ screen, tap the ‘Voicemail’.6: At the ‘Voicemail’ screen, tap ‘Your carrier’ under the ‘Service’ section. It will open up prompt named; ‘Service’.7: If you are using double SIM Android device, you will have more than one choice of carrier. But, as I am using just one carrier, the prompt will not give me any option but just ‘Your carrier’ is opted by default. But, if you want to cancel the option, you may tap ‘CANCEL’.That’s all!