We took a closer look at the coverage from the three largest companies, AT&T, T-Mobile and Verizon.

If you're worried about dropping coverage with T-Mobile service, it would be smart to check out its coverage map before signing up.

AT&T has the best coverage, with narrow gaps in the northern portion of the state, stretching into North Dakota, as well as Minnesota.

We took a closer look at the coverage around Oregon from the three largest companies, AT&T, T-Mobile and Verizon.

AT&T covers a larger continuous swath of Illinois, but coverage drops to almost zero once you enter Iowa or near its borders with Illinois and Wisconsin.