How Do I Send an SMS message From UK mobile to a US one

[possibletarian]

You need to put 001 then the mobile number (EU has a special USA code)

Sorry you wanted USA to UK

First dial 011, the U.S. exit code.

Next dial 44, the country code for the U.K.

The the mobile number (omitting the first 0 )

Found that out the hard way. Almost everywhere the code is 001, in the US it is oddly 011. Why? No idea, I could probably look up the history, but lack motivation

On top of that the service provider could have international texts blocked. I have happened upon such before. Bit odd, but there you go. Depends on the plan you are on, I guess. Being European, these things do not apply to me. AFAIK, with most european providers this is an option to which you can opt in if you want to block access to international texts, Far as I can tell, it is plan dependant in the US.

To give that some meat, my current plan allows me unlimited calls, texts and data. The calls are restricted to a country list, I grant. Text and Data is not limited at all.

As usual, there is a fair usage clause. Over 20 GB of data per month would be a breach. I have been as high as 50GB per month and no charge. So how much does that facility cost me? Roughly €40 a month. (I say roughly, my US calls are out of contract)

I tend to use whatsapp as my messaging service, it free if connected to wi-fi, and uses little data if not.