I imagine the 2G network they are talking about is GSM, which is a 2G open standard created in the EU and used internationally.

> It was first implemented in Finland in December 1991. By the mid-2010s, it became a global standard for mobile communications achieving over 90% market share, and operating in over 193 countries and territories.

https://www.wikipedia.org/wiki/GSM

The iPhone 16e Tech Specs page lists 3G (UMTS/HSDPA) support. It's missing CDMA, but they already dropped that way back with the iPhone 14

https://www.apple.com/iphone-16e/specs/

5G NR (Bands n1, n2, n3, n5, n7, n8, n12, n14, n20, n25, n26, n28, n29, n30, n38, n40, n41, n48, n53, n66, n70, n71, n75, n76, n77, n78, n79)

FDD‑LTE (Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 29, 30, 32, 66, 71)

TD‑LTE (Bands 34, 38, 39, 40, 41, 42, 48, 53)

UMTS/HSPA+ (850, 900, 1700/2100, 1900, 2100 MHz)

GSM/EDGE (850, 900, 1800, 1900 MHz)

Yeah you are right. I checked the website again. The missing one is DC-HSDPA. I incorrectly think that is the entire 3G networks.