The process is very simple. You'll just have to click the green phone icon, the same place you make calls, and navigate to the voicemail screen. On the voicemail screen, you'll see a greetings option on the top left.
On the home screen, expand the App Drawer and tap on the entry named Visual Voice Mail. You’ll be taken through some introductions screens that will showcase some of the capabilities of Visual Voicemail. Tap on Start to configure the service.If you’re a new customer or you haven’t gotten around initializing your voicemail, you will be prompted to do so. But if you followed the first guide, that won’t happen. In any case, after you enter your voicemail password, tap on End Call. After a short waiting period, your Visual Voicemail should now be configured. From the next screen, you can Set your personal greeting or hit Ok to skip this step. To check a voicemail with this service, open the App drawer from your home screen and tap on Visual Voicemail.You’ll see a list with all your voicemails. You can select them All or tap the New tab to only display the ones that you haven’t listen to so far. After you open a voicemail, you can listen to it by tapping the Play icon. To delete a message, tap the trash icon then tap Delete.

In sales, immediate communication with your prospects and current customers is important. Being available to answer questions or further negotiate a deal allows your clients to feel secure and more apt to purchase from you. But what if you can’t answer the phone when they call? Make sure you have a voicemail system set up so your clients have the opportunity to leave you a message.
Sometimes when your iPhone experiences issues related to your cellular network (no or poor service, calls going straight to voicemail), the problem is stemming from the cellular network, not the iPhone itself.