And when you're new to an area, your carrier probably has your entire region colored as 'Excellent' on their coverage map, even though the only places you can actually get a signal is if you stand in the middle of the highway interchange out on the west side of town or up on one of the rooftops downtown. You have to ask around among the locals to find out which carrier _actually_ works in your town so you know which to switch to. Until then, wi-fi is your only comm link unless you can still find an old payphone.
And naturally if you're just visiting or passing through, you're not going to want to change carriers every time you stop at a new town.
And when you're new to an area, your carrier probably has your entire region colored as 'Excellent' on their coverage map, even though the only places you can actually get a signal is if you stand in the middle of the highway interchange out on the west side of town or up on one of the rooftops downtown. You have to ask around among the locals to find out which carrier _actually_ works in your town so you know which to switch to. Until then, wi-fi is your only comm link unless you can still find an old payphone.
And naturally if you're just visiting or passing through, you're not going to want to change carriers every time you stop at a new town.