I have two phones with the same number, one for home and one for work, can I get my whatsapp messages to come to both phones at the same time or will they only deliver to one of the two?
No, you can only use Whatsapp with one number on one device.
Quote from the FAQ page:
Can I verify one WhatsApp account to multiple phones, or with multiple phone numbers?
Your WhatsApp account can only be verified with one number, on one device. If you have a dual SIM phone, please note that you still must choose one number to verify with WhatsApp. There is no option to have a WhatsApp account with two phone numbers.
If you attempt to frequently switch your WhatsApp account between different devices, at a certain point, you may be blocked from re-verifying your account. So please do not repeatedly switch between different devices.
No You can use WhatsApp with same number in only mobiles. But that does not mean you can't, WhatsApp is providing such facilities called web whatsapp.simply you have to open your browser,like google chrome then open www.web.whatsapp.com there you will get QR code,open your WhatsApp application for ones,click for an option there you get WhatApp Web on clicking that it shows QR code scanner, you have only to do scan the QR code that is already opened in your browser, After scanning it will display all the conversation. and here you can use WhatsApp at another place.
But there is a little limitation for using web.whatsapp that mobile having sim card should be connected to internet