How do I call a cell phone in the usa from the uk?

Question

Hi! I need to call a cell phone in the usa from the uk. How do I do it??

The cell phone no begins 1-845-???????

What is the dialling code for the us??

Any help would be great! Thanks

Answer 1

Dial 001 before the number.  If that doesn't work, try just 00

Answer 2

Dial 00 in front of the number: 00 + 1 845 ??? ????.