Well, it does not matter if the country has no 2G. The thing is, that your phone is 2G compatible. They tell the phone something like “ehh, at this spot we have only 2G roaming” and phone is like “sure, let’s downgrade to 2G”
Australia is currently in the process of phasing out 3g, which is annoying cause a 3g hotspot is the only way I can consistently get my 2ds connected to the internet
Hu? Hotspot is wifi, so what Generation of mobile Network is used should not impact that. The problem with DS would only be wpa2 not supported, but that does not matter, if you do not set a password.