Funny, the majority of us have a phone on us more hours of the day than not, but actually we’re harder to talk to than ever. On personal calls, and especially business calls, you’re much more likely to reach voicemail than the actual person you’re hoping to engage in conversation.
If you recently restored or updated your iPhone, your network setting may have been affected and may be causing “iPhone voicemail error try again later.” Please reset your network settings. Go to Settings > General > Reset > Reset Network Settings Enter your password. Press Reset network setting in red font. The phone will automatically reset it. After it restarts, your phone then tries voicemail again.

9. Hang up. Once you've selected a greeting, press the red End Call button to hang up and exit your voicemail system. There you have it! You now know the basic steps for changing your voicemail greeting on your Android phone.
It doesn’t have to be that way, though. First of all, leaving a voicemail isn’t that big of a deal. It’s just a message. Less than a minute of you talking, and that’s it. It’s doesn’t call for panic.