A printed circuit board that allowed older 30-pin SIMMs to be plugged into the newer 72-pin socket. The board contained a 72-pin plug and a number of 30-pin sockets. SIMM converters were also used ...

That's why the eSIM was invented. Instead of a card, the SIM is stored electronically in a dedicated chip. That's the system used in US versions of the iPhone 14 range, and many Androids have it too.

A Single In-line Memory Module (SIMM) is a type of memory module containing Random Access Memory (RAM) which was used in computers from the early 1980s to the late 1990s (think 386, 486 ...