Message not sent, phone number formatted incorrectly.

[nfuller]

Hi! I'm based in the UK and I've been attempting to message an American phone number, but every time I do I receive the error message "Message not sent. Phone number formatted incorrectly."

This is with all international numbers, as I tried to message another American phone number too and got the same issue. I've tried restarting my phone, I bought the International Bolt-On just in case that was the problem, to no avail. I've tried formatting with +01 +011 and without either. I've used both the - (so for example 404-567-8789 and also 4045678789 *not the actual number obviously) and nothing is working. I've been trying for a month now and any searching on the internet has proved fruitless. I would call O2 usually but of course right now that's not possible. 

Would really appreciate some help with this, thanks to anyone who might be able to help in advance!  

[nfuller]

@MI5 Oh no! I'll see if I have any luck tomorrow then. Thank you so much for your help, massively appreciated. Have a good evening!

[MI5]

You're welcome and good luck