Not necessarily. I bought an iPhone SE with the main intent of using it on Sprint's network, but I didn't want the Sprint model in case I ever decided to put my Verizon SIM card in it, which I have a few times. I wanted the best coverage overall on both networks, so I bought the AT&T model. The only band I'm missing for Sprint is band 41, which offers faster speeds but not better coverage, but Sprint doesn't even have band 41 in my city. As long as I get decent speeds (which I do) I don't need dozens of Mbps. I care more about having a decent signal on any network I choose than crazy fast speeds.