Hawaii is well-covered by major cellphone service providers in the United States. Some of the major carriers that offer service in Hawaii include:
Verizon: Verizon Wireless provides extensive coverage across the Hawaiian islands.
AT&T: AT&T also has a strong presence in Hawaii, offering coverage in urban areas and many rural locations.
T-Mobile: T-Mobile's network covers most parts of Hawaii, including cities and towns.
Sprint: Note that Sprint was acquired by T-Mobile, and its services now fall under the T-Mobile brand.
These major carriers offer 4G LTE and 5G coverage in urban areas, and 3G/4G coverage in less populated or remote regions. Additionally, there are smaller regional carriers and Mobile Virtual Network Operators (MVNOs) that utilize the infrastructure of the major carriers to provide services in Hawaii.
Before choosing a specific carrier, it's a good idea to check their coverage maps to ensure they have adequate coverage in the areas you plan to visit or reside in Hawaii. Cellphone coverage can vary depending on the specific location and the type of device you are using. It's also worth considering the specific plan offerings, pricing, and features to find the best fit for your needs.