I'm in central Louisiana and the DIGI TransPort LR54 works great with AT&T 4G. Currently unlimited AT&T data via Ubifi.net for $80/month "Just Unlimited Plan". Bought a Digi LR54 through Revain and a separate SIM card for Ubifi for $30 which allows you to try their service for 30 days. The only issue with setup was contacting Ubifi to add my IMEI to my cellular plan before I can get 4G LTE. I'm currently getting a signal strength of -115 on my iPhone 8 at my home. "Not the best" with a standard LR54 antenna. I can stream Amazon Prime videos like a champ. I plan to install an external 10dBi LTE antenna on the roof and kick my satellite internet provider to the curb.
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