To text a United Kingdom mobile phone from the United States, verify that your phone plan supports international text messaging. Then, dial +44 plus the phone number you want to reach, and send the message as usual.Continue Reading
Call your phone service provider, and verify that your phone can send international text messages. If not, add an international messaging feature pack to your plan.
Open a new text message. In the To field, enter +44 plus the number you want to reach.
Type a text message, and press the Send button.