[helpless]

i have this problem as well, I can phone and text from US to UK but I can’t make any calls to US cell or land lines
I get the message unrecognised number
I have tried just the number , the number prefixed with a 1, the number prefixed with 001 as I would if I was still in the UK and in desperation UK prefix 44 followed by U.S. international code 001 and then the number, all to no avail

I am able to receive calls from US phones whilst in US

My phone is a HTC C

Can anyone help me

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