Leaving voicemail messages and inbound calls not working at all in Brazil

[seb]

I am currently in Brazil with my Smarty sim. Before leaving UK, I diverted all calls to a UK landline number. This worked for the first 2 days, but now I discovered that anybody trying to call my Smarty number, gets the audio message "It has not been possible to connect this call. Please try again later". I am still receiving text/sms messages. I have used the codes from here (#002#) https://help.smarty.co.uk/en/articles/1463317-setting-up-call-forwarding to cancel all diverts - but that didn't make any difference. I contacted Smarty support, who, after asking me to reset the network settings on the phone, then giving me some codes for Apple phones (although we discussed already I am on an Android phone), now they tell me voicemail doesn't work when roaming in Brazil, unless I buy an add-on. By that, they mean people can't even leave a voicemail message. Which I'm fairly sure is non-sense - unless anybody knows otherwise?

I am at the point of assuming that something has gone wrong at network level, and Smarty have no idea what is going on and are just fobbing me off. Does anybody have any idea what else I could try please? I am kind of guessing I am most likely stuffed until returning to the UK.

[seb]

I'm replying to my own post in case it helps anyone in the future. In the end I managed to get call forwarding working again by resetting and reconfiguring it several times using the codes 21, 62 and 67. For some reason 21, which is supposed to be for all calls, didn't seem to be enough. What I then found out was that, as I was moving between different parts of the country in Brazil, it kept on breaking the call forwarding - and calls would end up going nowhere - not to my phone, nor to the number configured for call forwarding - so I had to start all over again. Maybe it had something to do with the phone hopping between different local networks/providers. And on the way back to UK, when I stopped in Germany, again, I discovered call forwarding was broken and had to reset it all over again. I'm not exactly sure what it all means, and why moving from one location to another seems to break call forwarding. It was a pain to have to try a number of times until call forwarding was re-enabled - but at least I managed to get it to work - to some extent. Although people not being able to reach me - not even through voicemail - between call forwarding being broken and me realising and fixing it, wasn't ideal at all.