https://wccftech.com/2020-iphone-se-is-dual-sim-features-nano-sim-esim-support/

The new 2020 iPhone SE is a dual-SIM iPhone with full support for nano-SIM and eSIM so you can use two phone numbers simultaneously.

Just like the iPhone XS and iPhone 11 lineup, the new iPhone SE features dual-SIM support, meaning you can use two phone numbers at the same time. You can have the secondary phone number on standby or just use it for data, the choice is entirely yours as long as your carrier supports eSIM because that's how the iPhone SE goes about its business. There is one nano-SIM card slot in the iPhone SE.