_setValue with phone number cuts off first number of area code

Ivan

Hi, I have the following statement:
_setValue(_textbox("ctl00\$cph\$mtbMasked\$rmtMasked"), "2507890987");

When it runs, it drops the "2" and only puts "507890987_" in the phone number field. However, if I add an extra digit to the end it will add that last digit.
Any help would be appreciated...