I set the guest's entry code to the last 4 digits of the booking cell phone number. 

We had gold backing our currency when gold had no industrial uses, but now it's in all our cell phones and computers and everything, so that wouldn't be a good backing for currency.

@Michael WillisHi MichaelWe have almost 900 units, and have gotten together will a cell phone tower company.

Now does the owner run their cell phones through the business?

Message me for his cell phone or you can find the business number online.

He refuses to answer or return my calls to his cell phone, emails, or calls to his work. 

You might need to use a 2nd cell phone. 

Each letter has my cell phone number and I will be taking calls directly, should be intersting to see how this goes.I'm keeping track of mailings on separate lists (type of motivated seller) on an excel spreadsheet and plan to mail out once a month.

The last wire I got was delayed until a title person could get hold of me by voice (cell phone), he made me pull up and verify who I was, bank wire instructions, etc.I'm not so sure about this wire stuff anymore. 

These would be things like business mileage on your personal vehicle, a home office, maybe your cell phone and internet, etc.