Indeed. But I haven't come across any phones that let you specifically disable 2G(GSM). Most let you disable 4G or 3G, or let you prioritise one over the other, but disabling 2G altogether seems to be missing.
On Android dial [star]#[star]#4636#[star]#[star] in the phone app and you can change what types of cell networks can be connected to. Apparently doesn't work on all phones, but definitely works on my stock Nexus 5X on Android 7.
My Blackberry Priv lets me select any combination of LTE, 3G, and 2G. I currently have it set to use LTE and 3G only. That's the only phone I've seen with that feature, though.
