There's a web interface called "Popularity Dialer"
I think it only works if you're in the USA.... but maybe there's something similar available in Canada
You set it to call your cell phone , you can set it to call once or several times.
Your phone will ring at the pre-set time/times and carry on a conversation with you,,, that way the person you're with can hear a voice talking to you and you can talk back to make it look like a conversation.
It has several different recorded conversations by male and female voices, you choose whatever suits your purpose.
Link to Popularity Dialer
There's also a nifty little website that offers you the ability to change what someone sees on their call display when they receive a phone call from you.
When they look to see who's calling; you can show any phone number you wish.
So let's say you're at home but you want someone to think you're at work..... you tell it to display your work number to the person you're calling.
http://www.spoofcom.net/