My cellphone isn’t taking messages when it’s on. I think my diverts are wrong. But thanks to this page at Vodacom I can use the following settings to divert calls to voicemail:

Technorati Tags: South Africa, vodacom, voicemail

Divert calls to voicemail when you expect to receive high volumes of calls.

Unconditional divert: **21*082131 [last seven digits of your cellphone number] #
If no reply: **61*082131 [last seven digits of your cellphone number] #
If cellphone is not reachable: **62*082131 [last seven digits of your cellphone number] #
If busy on a call: **67*082131 [last seven digits of your cellphone number] #
Cancel all diverts: # # 002 #

If your cellphone number has a prefix of 072 and not 082, replace the 082 in the above examples with the 072 prefix.