Here is the dial plan I use on the 502. Replace 318 with your area code:

{^1900x|<=1318>[2-9]xxxxxx|1[2-9]xx[2-9]xxxxxx|<=1>[2-9]xx[2-9]xxxxxx|011[2-9]x.|<611=18004377950>|<411=18002464411>|x+|*x+|*xx* x+}