Can I use a locked iPhone without a Sim card?

I have a locked iPhone 6 to Telus. If I use my friends Telus Sim card to set up the phone and after it is set up, take the Sim card out, will I still be able to use it? Or will it only work if I keep the Telus Sim card in?

Absolutely, you can.

Yes you still can use it. You will only need the sim card to get through the setup process of the iPhone. You won't be able to get internet without a Wi-Fi or call people though

It would work without the SIM, but if you got an iPhone to be an iPod touch, it doesn't make much sense.