Before you forward a number to your AI assistant, there is one key consideration.
The 'Caller number' that will be saved will more than likely be the number you redirect from (i.e. your own number) rather than the caller's actual number.
This makes things like following up with calls and sending SMS messages a little bit less reliable, because your assistant relies on the caller providing that number voluntarily and accurately. You will also not be able to block callers.
That said, many of our customers forward calls from existing long-standing numbers with great success.
The answer to the question is that this is specific to each provider, but here is how several Irish mobile providers work:
Codes for activating diverts
Phone switched off/out of coverage (not reachable) *62 Number#
Phone busy (busy/no connect) *67 Number#
Phone not answered (no reply) *61 Number#
At all times (unconditional) *21 Number #
Codes for deactivating diverts
All calls ##21#
Not answered ##61#
Mobile turned off ##62#
Mobile is busy ##67#