EPO6-A & EP25-AF which carriers are supported in the US?

I have the above referenced modems and want to get the best diverity (live on a boat and sail around ). I currently have AT&T and T-Mobile. I believe they both use the same network so I am trying to get another carrier in case that network is not strong. What would be the best non T-Mobile / AT&T carrier that my modems would support?

In the US, it is T-Mobile, AT&T and Verizon. Unfortunately Verizon cannot be supported.

Other small carriers are either using AT&T or other big carriers network or directly managed by them.

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