SMARTY SIM in Doro 6520
Hi. I have put my SMARTY Sim card into a Doro 6520 flip phone (using a Nano to Micro Sim adapter). The phone won't recognise the SIM at all; red cross in the top left and SOS call only in the display. I believe the Doro 6520 is a 3G phone. Any tips gratefully received. Thank you 😊