Here are the steps you can follow to call the United States from Dublin, Ireland:
1. Open the Phone app on your mobile phone or dial the phone number on a landline.
2. Enter the exit code for Ireland, which is 00 or +353.
3. Dial the country code for the United States, which is +1.
4. Enter the area code for the city or region you want to call in the United States.
5. Add the local seven-digit phone number of the person or organization you want to reach.
The full format of the phone number you would dial to call the United States from Dublin would be:
00 or +353 - 1 - -
Make sure to check the specific area code for the location you are calling in the United States, as it may vary depending on the city or region.