It's easy to get carried away in a voicemail and include more detail than is necessary. We've all been in that situation where the automated or pre-recorded voice on the end of the line goes on and on with more information than you can take in.
When you’re recording an answering machine greeting for your home, or a voicemail greeting, some people like to keep it funny and light. They may record a message together, have one of their young children record, play silly music in the background or create some kind of a joke. While it’s fine to be funny, especially on a home recording, you should probably avoid being crude, particularly if you think children may be calling your home. Telemarketers may use any information given in an answering machine greeting.

One of the chief considerations in recording an answering machine greeting is your audience. Who will be listening to your answering machine or voicemail salutation? Is this a business line or a home phone line? Furthermore, just how much information do you want to give out to potential strangers, like telemarketers, who may be calling your home? Long answering machine greetings may be inconvenient for callers.
To set up voice mail, tap the Phone icon, tap the Voicemail icon and then "Greeting.". There are two options available: Default and Custom. If voice mail hasn't been set up previously on your phone, Default is selected, which means people will hear your wireless carrier's generic voice mail greeting when they call you.