Can I track my iphone even if its not connected to Wi-Fi?

I have track my phone and icloud set up on my iphone. I lost it 2 days ago I was able to track at first now its not showing anything anymore. I think someone took out my sim card. Can it still be tracked if they connect to Wi-Fi? Anyone know why its not being tracked anymore?

Here is the thing.

When you found it first time, you should have alerted the cops. With last known location.

If someone removes your SIM card, the phone still can be tracked if it is on the internet. But looks like they wiped the iOS clean so your settings are gone.

So unless you were on iOS 7, any old OS, they will be able to use the phone.

You can call your carrier, and say the phone is lost. They will block the IMEI number and the phone can't be used.

Put ad in local craigslist, and provide details about phone / serial numbers so good samaritans will help you track the phone if someone is trying to sell.