@aidan11
Thanks for the update. If you don't VoLTE provisioned in your account and/or enabled on your phone your voice calls while Roaming can only access T-Mobile's 2G network. While in the west the 2G network is relatively available in urban areas it is unreliable if even available in rural areas. It is better in the eastern US but Florida does not have good 2G network coverage even in the urban centres.
The 4G LTE network has good coverage with T-Mobile's network coverage at 62% just behind At&t's 68% but in any state with mountainous terrain like Washington state coverage is spotty outside of the major centres. In general US providers are not required to have same network coverage in rural areas as network providers are regulated to have in Canada. There are many rural areas in the US with little or no coverage (Alaska, Oregon, Maine and West Virginia among others) so it's important to understand the limitations to roaming service. With VoLTE the overall US Roaming service will improve and will be more or less on par with first tier provider's "Roam like Home" service but at a considerably cheaper cost.
While your first experience has not been satisfactory and you have been issued a credit if you decide to purchase US Roaming add ons again use the info and references contained in the following thread to familiarize yourself with how US Roaming add ons work so that you have a better experience. Public Mobile is DIY service to a certain extent and if you are used to and can afford to make the choice and pay for first tier provider service then that's your preference. But if you need some help or troubleshooting while Roaming in the US the community is here to be of assistance to you.
https://productioncommunity.publicmobile.ca/t5/Get-Support/US-Roaming-Add-ons-Decommissioning-of-US-...
Note: The above thread has not been updated with the current roll out of VoLTE calling but the 2G network info applies if you cannot access VoLTE calling on your device.
