Regarding who called the police....Laci's mom said Ron called....but the Modesto Police Dept's website says this:
On 12-24-02 at about 5:48 p.m., Modesto Police received a phone call from a man stating that his pregnant wife had not been seen since 9:30 a.m. that day.
So you are probably right that both did call.
It's been awhile but i think SP arrived about 4:30 looked around called Mr Grantski who called police when scott hung up,and then scott got through to them after....