The Dual SIM management interface at least under Android 10 is badly designed. With two SIMs inserted, esp. when they are of the same mobile operator, I struggle with quickly determining which status bar icon or SIM card list entry refers to which SIM card.
What best practices are available to help deal with this situation?
By "badly designed", I refer to these issues:
The SIM card list in Android settings and the SIM icon list in the Android status bar do not make clear by which criterion they are ordered. They do not make any reference to the concept of a "first" and "second" SIM card, so it is not even clear if there is such a concept at all in Android.
The freetext "SIM names" that one can assign to SIM cards in Android do not make clear if they are names for SIM cards or SIM card slots.
At least for some SIM cards, the SIM info screen of Android does not list any information. Neither the card's phone number, nor the SIM card ID (a long number printed on the card), nor any other ID.
When one connection type abbreviation ("4G", "3G" etc.) is written between the two signal strength indicator icons in the status bar, it is unclear if SIM1 (left icon) or SIM2 (right icon) has the active data connection. Of course, one could remember that the connection type always refers to the icon following it, but one will also forget again …
On top, the layout of the SIM tray on some phones (e.g. Galaxy Note 9) is counterintuitive as the first SIM card is at the bottom, while in the Android UI, the first SIM card is always listed at the top. The tray has "SIM1" and "SIM2" written on it, but this is very small and easy to overlook.