Hi @Icky,
Are you still experiencing this issue? When you say there's no coverage, your phone is showing no signal, or a message like emergency calls only?
The USA has already shutdown 3G in most locations, so this may be the issue, there's some further info and links that may be of help in 4G Calling Abroad
As @sc1999 mentioned, manually selecting a network may help, as you may find that the network your phone is trying to connect to automatically has an issue. Usually this can be found by setting "network selection" or "carrier selection" to manual, then if you test the different networks on the list available hopefully one should connect successfully.
If you do set up a manual network selection, remember to set this back to automatic when returning to the UK, or if you visit another country before returning.
Thanks,
JonathanB
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