Received 'welcome to USA' text. Unable to make or receive calls or send texts. Account shows international barring off and call roaming enabled. Roaming enabled on phone. iPhone 13 (UK settings) and iPhone 6 (shared account, different numbers) both affected..
Thanks for your post and welcome to the community.
Can I ask you to check the SIM toolkit settings for international roaming?
To do this;
Select Settings from the Home Screen
Select Phone Icon
Select SIM Applications
On newer iOS 14 - Settings -> Mobile Data -> SIM Applications
Select International and you are done, go back Home screen to retry.