GrapheneOS implements a similar feature which limits to 4G cellular networks. This is great if the phone decides 3G or 2G connectivity is better, but I know th

GrapheneOS implements a similar feature which limits to 4G cellular networks. This is great if the phone decides 3G or 2G connectivity is better, but I know the 4G network is faster (still slow). A downside is that if the 4G network is completely overwhelmed (e.g. on a festival), the phone might not receive phone calls or sms it'd receive if it could switch to 2G (happened to me. The phone had 4G connectivity, but SMS didn't work without allowing 2G).