Basically like the Jolla phone then, which only has 2G internet in the US.

Is the support for all (or nearly all) 3G/4G networks limited to higher-end chips? I believe at least e.g. the iPhone has identical hardware worldwide?

went to the specs page, and this is what it said:

Wi-Fi 802.11 b/g/n Bluetooth® 4.0, Bluetooth® 4.0 hardware compatibility (software not currently integrated). 2G GSM (850/900/1800/1900) 3G HSPA+ (900/2100) GPS and A-GPS

list of HSPA+ networks for ref: https://en.wikipedia.org/wiki/List_of_HSPA%2B_networks