Your financial position will dictate if you answer the (011) Johannesburg area code call or not. Some of the downsides to the area code (011) is that debt collectors are calling in the hopes that you will commit on record that you will make an attempt to paying a portion off your debt. It appears that Financial companies have gotten smarter and realised that people actively ignores calls from Johannesburg area code and have changed their numbers to different codes. In the same regard, people have gotten smarter and downloaded TrueCaller and it allows them to avoid answering calls form debt collectors.
The Upside of receiving a call from area code (011), is that individuals on the job market see this landline as an opportunity and it comes with emotions of excitement and not to mention the nerves when answering to find out if one has been short list for a possible Job interview. For people on the market have their phone in hand answering every call is paramount they would not want opportunities to miss by being negligent.
Depending on which side of the fence one is landline phone will spark emotions be it good or bad.