The Vodafone Galaxy A20's sim tray:
https://i.imgur.com/90AE2dI.png
Has anyone tried to get a third party tray with dual sim and see if the phone detects the 2nd sim? Or is it hard locked (missing hardware for another SIM) or soft locked (changed by firmware)?
You need to look up the model number.
Models SM-A205F, SM-A205FN, SM-A205GN, SM-A205YN, SM-A205G, SM-A205W, SM-A205U
https://www.samsung.com/au/smartphones/galaxy-a20-a205/