When I use my mobile phone:
While in New Jersey:
I use my mobile phone primarily when I'm traveling out of state. When I'm home I carry it around with me for emergencies, to contact people when I'm going to be late or lost, or to get voice mail on my main number.
Most of the time when I'm out of the house I'm driving, in an ambulance caring for an injured person on the way to the hospital, in the library or a meeting.
I DO NOT USE MY PHONE IN THOSE SITUATIONS - IT'S ILLEGAL, IMPOLITE, ...

You might be able to reach me after 4:30 on the first Tuesday of the month when I take the train into New York for a genealogy meeting and walk uptown from Penn Station.

I check for messages every couple of days.

The message on my phone says something to this effect, but people still leave me messages like "Can you substitute for me at tennis this afternoon?".
The assumption is if you have a cell phone you constantly run around with a blue tooth headset stuck in your ear. NOT ME FOLKS, SORRY.

When I'm out of town:
My home phone message will say I'm out of town.
I use my mobile phone most of the time.
However, I am frequently in the Sierra Nevada Mountains at one of several places I stay where cell phone reception is unreliable, or camping in an area where there is no reception.
My travel number may be more useful then.
When I am overseas I replace the SIM card in my phone with an international SIM card, so my normal mobile telephone number is different. See international calling.

What you should do:
Call my home phone.
If I'm out of town it will tell you, so try my travel or mobile numbers.
If I'm not out of town leave a message.
My calendar is online and I can give you access if you'd like.