My iPhone is saying no service?

I just bought an iPhone 4S today and cut my SIM card from y blackberry to fit it. It worked for about 4 hours before I tried to set it to home only and it's said no service since them. I tried setting it back to automatic and that didn't work either. And now Telus won't let me call them on my phone and the contact us page on their website is down too.

Try to turn it off and on again