I recently had my phone's mainboard repaired. It is a dual sim phone. However now a second sim is not recognised. It does recognise the memory card though. Could the wrong mainboard be have fitted?
@ripink: Where did you get the phone repaired? Have you tried giving the gold contacts on your second SIM a rub to see if this helps? If you place the second SIM into SIM slot 1, does the issue persist?
Hi. It was replaced at a Samsung Service Centre, under warranty (which has now expired). Tried the gold contacts, and also both SIM cards in my Note9 dual sim. Work fine in there. Noticed that the Sim Manager menu is missing from the S9+, also there is only one IMEI number shown, whereas the Note9 shows one number for each SIM. Even tried swapping the SIM trays over.