the desired results. Calling internationally from a landline International numbers are often written with a + sign in front of them, as shown below: +44 (0) 20 7323 800 This is the number for the British Museum in London , which we will use for our demonstration. Click on the telephone above to see a video demonstration of calling from a landline. Shortcuts Cordless telephones often store a number when you dial it, and then they rapidly dial the number without any pauses when you press the "call" button (usually a green button). Sometimes this is too fast for international switches - depending upon the country. Instead, press the "call" button (green button) before you dial and wait for the dial tone, then dial the international number!